Winrar, if u mean this.
Yes that is what I meant.
So, no I have no idea how you can fix it. maybe you can try to download it via itch app : https://itch.io/app
Hey Harumaki.
It's a zip file you dont need Winrar to open it, and I experienced problems with PeaZip.
You just have to right clic, open with "file explorer" or something like that it's the basic zip opener of windows.
Try this. :)
Also be sure to save the zip file on your desktop and after that unzipping it, if it's not already done.