I had already looked at the thread, but I did not find the answer, Because I had not read so carefully . But now I found it. Thanks for the help! "Let's do some art!"
When I'm trying to uninstall paint.net:
When I'm trying to install it:
The text in English: Another version of this product is already installed. Installation of this version can not continue. Use the Add / Remove Programs in Control Panel to configure or remove the existing version.