Gigapixel Will Not Open. Missing the uninstall file

Gigapixel AI is not properly installed it seems so will not open as a stand-alone or as a plugin. I cannot find the ininstall.exe file. The shortcut points to the uninstall.exe file in the DeNoise AI folder. Revo cannot find it. What should I do?

Install Gigapixel over the existing files? Then uninstall then re-install? Use Revo to un-install? Perhaps I can be sent a link to download the Gigapixel uninstall file?

The De-Noise AI, Photo AI and Sharpen AI work fine.

My PC OS: Window 10, 64bit.

Please help.