The Seyret product is nowhere ready for release. The demo version works perfectly on J1.5, but the Pro version doesn't work at all. The forum suggests disabling mod_security for your domain, which I haven't tried. This blame is placed upon the flash uploader.

The license supposedly allows one domain, and one sub-domain. They also don't support this feature. Support is non-existent! Documentation is very poor, and doesn't illustrate any features or usage of this product.

Uninstalling the Pro vesion to test it or use it on my live site, left my demo site in a condition that module locations in content are confused, and portions of the css style are ignored. I may have to recreate the whole demo site! This may be because of hacks that need to be applied through the Seyret control panel.

Check the forum, and you will find many unhappy users. If you have not migrated to Joomla 1.5, I'm sure the product works perfectly, and the concept of the product is very useful!