You may try download it here - https://github.com/Chleba/PIXELARTOR/releases
Okay, I took my time to try it well and I think (I might be wrong) that the windows build has an issue. From Itch.io using the client and using direct download from the website and also from using the github link you provided, I can confirm that I was able to download the software. Unfortunately, in none of those case, I was able to complete the installation process. It always stops before. Here is are two screencaptures (1 from the github download and 1 from the itch app client):
note that this progress is what I had after letting it run for about 16 hours so i think that it's safe to say this installation process won't be completed
Hi, I am terribly sorry about that. Electron builder have some issues in Windows with installer. So sorry about that.
Actual version 0.2.1 is portable, so just uninstall previous version and download it from Itch.io app and it should be fine.
I am very sorry about that again. Please let me know if that worked. Thank you.
Oooh no, no need to be sorry at all. I'm the one who is lucky to be able to test this software. I will download that new portable version and let you now how it works ^_^. Thanks again for the effort to help.
Edit: I opened, yeaaaaaaaaah. But there seems to be a bug with the interface. Here is a screen capture.