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JUpgrade is an extremely valuable tool, but it works truly well only if you have an extremely simple website with very few extensions.

I realize that many users are frustrated here. Okay, in my case the update has not worked. I examined my environment and noticed that even during the upgrade jUpgrade doesn't create a new database schema. All other queries will fail. My solution: Joomla 2.5 installed manually in /jupgrade. In jUpgrade skip checks, skip download, skip install. The following update statements will work and the Joomla update is still successful. Hope this helps.

True, it's far from perfect but finaly it did the job. jUpgrade has a poor error handling, it did not detect that Curl was not installed. Once I solved that, it worked.
Make sure that when you change jUpgrade parameters, you do a screen refresh (F5) after saving them.
Conclusion: it works (for me), but it is not a 'pearl'!

This seems to be a universal problem these days. I have seen ZERO reports of success using JUpgrade lately. My try on a simple test site I have - one that uses no extensions other than the standard package, fails the exact same way.

I've seen lot's of complaints about this on other forums. So I thought I'd give it a try on a trivial test site I have.

It leaves a big security problem too unless you clean up after it. The URL:
www.what-ever-your-site-is.whatever/jupgrade is left with the install directory in place, so anyone can then log in to the (empty) new site.

Interestingly the support links under
docs.joomla.org/Migrating_from_Joomla_1.5_to_Joomla_2.5
all fail with a 404.

Oh well, this is turned out to be a totally useless migration tool.

Regards,
Bill

Installed jUpgrade, have all requirements to make migration, but when I start jUpgrade process stops after step2-downloading joomla 2.5. Nothing happens from that moment.

com_jupgrade-2.5.1 installs with ease, error free. There is a place to configure your options before clicking on upgrade. After clicking upgrade, it appears to be working, but it gets stuck at Upgrading progress... Migrating undefined. It does not work. Many people, including myself, have posted this on the support forum with no response. There is no support. If you then go to yourwebsite/jupgrade, you will be redirected to yourwebsite/jupgrade/installation/index.php which gives anyone access to install Joomla on your website. The upgrade does not finish, the Joomla installer is not removed. This leaves a security issue.

Not a great reviewer, but I tried a few goes at this component and it worked for me , this is what I did.
Starting from live joomla 1.5 site.
Install akeeba to live site and make a back up.

Akeeba procedure if you are unfamiliar akeeba.
FTP to your live site directory and follow through
mysite/administrator/components/com_akeeba/backups

FTP the mysitebackup.jpa to your desktop.

Go to your hosting account cpanel
create a new folder in the public_html
called something like /upgrade and ftp the mysite.jpa to there.
(mine takes a long time ! )

Go to database wizard in your cpanel or my databases in your control panel and
create a new database.
Make a note of the name, the user and copy and paste the password
of the database to a text file.

upload by ftp or file manager the files
kickstart.php and the language file en-GB.kickstart.ini
( available from Akeeba)

then reinstall your joomla 1.5 site so you now have a duplicate site.
Now change the default template to anything and uninstall the template
you were using.
Install the jupgrade and run.

Now follow the route to your new 2.5 joomla.
What you actually have is a 2.5 version installed inside a 1.5 version.

Install akeeba to the 2.5 visible site and run the back up.

Go through your ftp programme and you will find in the list of files
etc a directory called jupgrade.
That is where your 2.5 version of your website is hiding.
Follow through jupgrade/administrator/components/com_akeeba/backups
and download the mysite.jpa to your desktop.
MAKE SURE TO select a folder, NOT just downloads.

This is a 2.5 version of your website.

Make yourself another folder on your server / restore
create a clean database and ftp your 2.5 back up to the folder
enter the new database details into the installer

Reinstall following the step by step akeeba instructions.
The upload your favourite template, select it as default
and then re asign the modules and fine tune.

This worked for me, just a few tweaks to go live.

Now you have a live 2.5 hidden from the public.
move it to where you want.

What you will NOT have, coms and modules that are not 2.5 compatable.
If you have a list of events etc, that will need to be re written etc.
But you have two versions of the site, so you can compare content
and write up the lost detail.

This is a good free component, not magic !
It does work with limits, so please stop complaining.

I expect there are a thousand easier ways to do this.
and if you know a short cut please tell me.

The reason for uninstalling the default template is that
the upgrade seemed to lock it in and would not let me re install
as the template was already there. But greyed out.

Thanks very much to the developer, a lot of hard work went into this.!

I have had a long day!

However, no excuse for this.

Firstly though, to all those that state it worked well and can't understand why other are suffering. We clearly are and congratulations on your success - we are failing to share it!

The software installed -instantly
I was presented with a UPGRADE button
(no warnings, no pre selected options - just click an go)

I clicked it went-
blindingly fast
nice graphics
nice animation load bars( made you feel it was doing something)

Done! Except my brand new theme, with all my 100's of articles, images etc
Gone!

My admin template - gone!

WARNING this programme may lose your site! It did mine and seemingly with no option to do anything other than click the UPGRADE.

How could I do anthing to prevent that, when the only choice I had was click upgrade or don't!

Yeah - pretty annoyed!

I WAS WRONG! THIS WORKED ALL OF 30 SECONDS AND THEN REVERTED TO MY OLD SITE. IT WAS WEIRD. NOT WORTH THE HEADACHE. I ENDED UP WIPING MY SITE AND INSTALLING J2.5. FAR BETTER THAN PRAYING FOR A MIRACLE IN SHEEP'S CLOTHING!

It does not migrate much. Just some of the file. But not the template, not the extensions etc etc.
Checked if my permissions were right, chenged the names of the tables and everything but it was a complete waste of time.

It does connect to the database though, but a fresh 2.5 install is quicker and better.

Was not sure if I succeeded from joomla 1.5 to 2.5 as it did not register on the admin panel version indicator top right. However I checked my database and surely enough it had the new prefixes and also the site loads twice as quickly. Thanks for this free component. If you have any clues on how to update the version indicator on the admin please respond.

I cannot say enough good about jUpdate. Once you get the hang of it, updating is a breeze and can be done for non-plugin heavy websites in no time flat.

People who have had issues, I completely understand. The first time I used jUpdate it was a little stressful but if you read all of the excellent documentation here on Joomla.org and on the Developer's site you should be fine.

Have used to migrate 6+ sites already and haven't had an issue with a single one. As mentioned above the support and documentation is top notch, the steps are easy to follow, and I haven't had a single glitch so far.

I do recommend backing up your site with Akeeba and DLing the archive before attempting to use jUpdate though - Just to be safe. 5 Stars.

I have never given an extension this low of a rating, however this component is very frustrating. It's VERY buggy and there is virtually NO support for it. You can leave a request in the forums of their site but you'll be lucky if you ever get an answer. After going through the motions with this component I cannot log into the back end (administrator) side of the new 2.5 install. No one seems to know the answer to this so basically this component is useless.

Joomla should have a much better way for us to migrate over to 2.5. I'm completely lost on how I'm going to do this. This certainly is no help whatsoever

I found it to work well, but it does require some diligence. A few things to watch out for...
1) Make sure all upgrades are completed as requested (Joomla higher than 1.5.19 - I upgraded to 1.5.25 first) before starting the upgrade
2) I did experience the "freeze" in IE, but it worked in Firefox
3) After the "migration", the new site is now at www.yoursite.com/jupgrade until you move the original files OUT of the root and the file in the jupgrade directory into the root. (there is a great post in the comments of the upgrade video on youtube on how to do this)
3) You will need to "clean up" the new site, as I found the JA Purity template from v1.5 had some differences from the default v2.5 templates, so plan some time to redo some banners, etc.

Other than that, it seemed to be a good process. Not including the "tweaks" to the new template, it took me less than 2 hours for the entire project, including research.

I did not understand why so many people complain about this extension. There is a great difference between Joomla 1.5 and 2.5 platforms, so it is obvious that this extension cannot upgrade everything automatically. But still, it saved me a lot of time by moving all the menus, articles and modules. If you are facing some difficulties, it can be because of the complexity of your web site. Do not expect much, be ready to do some work by yourself and thank that we have such an upgrade tool. :-)

I would to migrate jommla 1.5.26 to 2.5, but it dont works. I think, this tool is just for simply joomla installation, not more.

My first half a day trying to understand what I was doing wrong and hanging in the forums for ages scratching my head, I finally realized that there simply file ownership issues. Ensuring all files 644 and folders 755 (including the httpdocs dir), set ownership to apache and group to apache. Run the upgrade. no errors, all done. Change ownership back and set httpdocs to whatever it was.
Upgraded 4 sites from 1.5.25 to 2.5.x now with this no problems at all.
Will be great when it includes even more components and different modules.

Does not work. Promises that bit will upgrade your site but if you have content and articles and menus, you will lose all of it when this piece of unprofessional software tries to do something it cannot deliver on. And it is also something that when you see a low rating all of a sudden 5 star ratings pop up. This is not worth your time and effort and in all honesty the Joomla team should have better prepared the route for upgrading instead of relying on third party software. Poor management is all I have to say to that. When you have 20 sites that need to be upgraded and have to do them by hand again due to unreliable software. Horrible.

doesn't work, as others said... it seemed to go through the process and at the end it gave me 404 error... oh well...

Congratulations on a great extension. I can guess that your extension should and will be adopted as Joomla Core. It would eliminate the problems associated with older sites and upgrades.

Quick note: I had one glitch, I was migrating from J1.5 and I was not aware that I needed to set jupgrade to go to 1.7 first. Small detail: minor hangup. Completely my fault for lack of understanding. Otherwise EXCELLENT job.