So, new year new luck. I decided to download WC3 and give it a try again after the gazillion of issues - without luck.
It’s a fresh install on an NVMe drive /if it matters/ so no, it’s not corrupted.
Anyone else experienced such issue?
This can sometimes happen with any of our games where something else is interfering with the launching of the game.
It can usually be solved by running through the steps here: Diablo III Doesn't Launch - Blizzard Support
Should that also not work check if you have any Razer Software installed currently, if you do consider uninstalling it and retesting.
If the issue persists, please upload your system files to pastebin.com and reply with the links to the files using the preformatted text option to encapsulate the links.