Save yourself the time and look somewhere else.
We have an option to auto resize images. You just need enable it, and all image will auto resize with same width, height as your module width, height.
If you don't know how to use it, you can read documentation of this module there: http://docs.vinagecko.com/?extension=jssor_image_slider
If you still can't make it work, you can post your problem to our forum here: http://vinagecko.com/forum/free-joomla-modules/8-vina-jssor-image-slider
I don't know why you said: "don't waste your time with any of the extensions from this developer". We have many extensions there, and many people like it.
You should consider carefully before write negative review. Because you will kill a good developer with your untrue review.
Thanks for your time.
I got the file that I purchased about two hours later as an attachment to an email. Upon loading the module I realized that the module did not even have the basic functionality that the free version had. I had uploaded three test images to my server for the lite version and it worked great. The thumbnails were generated and I could cycle through the images in the folder. Great.
In the pro version, the images were mereley stacked on top of each other and no thumbnails were generated. I sent a message to the author hoping that it was just a wrong version of the file that was sent to me and that getting the correct file would just fix it. 15 hours now and still no word. I even sent them another email through their site but no response to that either. As a last resort I am posting a review here. It makes me question the validity of the previous reviews who rave about the absolutely fast and fantastic response of the developer.