Pokenman

YES! That did it. It's important that this keyword: PaintDotNet_516794892.msi be available in the event others who may experience the same installation error can find this resolution. I spent a long time trying to find this .msi file as a point of reference so I could uninstall Paint.net v.3.36 in order to do the update to v3.56. I'm very grateful for this forum and the Windows Installer Cleanup Utility in this thread. Thank you!

During the install process, the program looks for: PaintDotNet_516794892.msi It's not in the folder "Staging" where it supposed to be (with the other .msi's). It's supposedly for version 3.3.6 issued some time ago - 2008 I believe - so I looked around and found it. But when I tried to load it (3.3.6) the install program asked for the same file again - PaintDotNet_516794892.msi. Now I go to uninstall and start from scratch. Guess what? It asks for PaintDotNet_516794892.msi again, and now I can't uninstall it either. Any ideas?