https://bugs.winehq.org/show_bug.cgi?id=42446
--- Comment #3 from fjfrackiewicz@gmail.com --- (In reply to demattcp from comment #2)
What exactly is Wine-git? Is this something extra I need to download?
Wine-git is the nightly version of Wine AKA the latest possible version of Wine's codebase.
Yes, you would need to download the source code via a program called "git" and then compile the downloaded source code.