I updated from v1.1.1 to v1.1.2 but Gigapixel refused to open thereafter. I had to uninstall it and reinstall again - a real pain due to the online installer, with the large download and a slow internet connection - after which it worked.
The same thing happened to me but I did the update immediately after I purchased my license and I didn't know if there was some interaction. The updated version refused to open so I downloaded the installer again and installed it. It then woke up working and apparently my license is working because it isn't giving me messages about "X days left on your trial."
I was only able to compare one image previously enlarged in v1.1.1, but the updated processing was definitely less sharp in places. Whether it was any more or less accurate overall I was unable to determine on the basis of that single image.
I only did a single conversion and I couldn't determine any difference between the v.1.1.1 and the v.1.1.2 conversions. I was doing other things that day and didn't do any more testing.
Other people in the Topaz forum reported similar issues with the update process and also a much greater propensity to crash in the later version. It looks as if the 1.1.2 update has now been pulled, as the latest version shown on the download site has reverted to v1.1.1 again.
OK, time to wait until they've fixed whatever is wrong and try again then.
Question: this is the first Topaz product I've used and I find their website difficult to navigate. (And is very slow.) I don't know where they list information on updates. Release notes? The only way I know is checking this forum on LuLa and seeing when somebody announces an update here. Presumably there is a more direct way?
I think A.G. Gigapixel is a great program and I'm not complaining about teething pains. I'm also grateful for the insightful analysis I read about it on these forums.