If you are working in Windows on a PC, then Corel Painter has released a hot fix that corrects the problem with NET Framework 4.5.2. Again, if you are using a Mac, this fix isn’t necessary and you should ignore this post.
PC users should have gotten an automatic notification that the fix has downloaded and requests installation. If you didn’t, then go to Patches and Updates and download the Painter 2015 – Hot Fix. Save it on your computer and then double-click the saved file to install it.