I just downloaded the newest patcher from mega and did not get any warnings.
Then I manually scanned it, the results are:
Windows Defender: clean
ClamAV: clean
As mentioned above, because the patcher does change another file, it may be flagged as hostile by heuristic/machine learning scans.
As far as that goes, the scan is entirely correct, it is modifying a file, however, I've coded it so it will only change "Radiant-Win64-Shipping.exe" and while, yes, a bad actor could copy a system file to that name/location and then back it's unlikely it would modify it at all, as the patcher looks for certain binary structures in the file it's patching. It double checks that as well immediately before 'approving' the write. (Feel free to look at the source.)
If you are getting a virus warning still and are nervous about running this:
1. If you post here, mention what AntiVirus software you are using and what it identifies it as.
2. As others have mentioned, machine learning or heuristic scans often report false positives for the reasons mentioned above.
3. Check the sha256 hash of the file you downloaded vs what is in the mod/patcher's post and make sure they match. If they do, then I would say you can run it without risk.
4. You are welcome to grab the source out of the archive and run it with Perl (or compile it yourself). Admittedly it's extra work.
5. You can use CheatEngine instead (this isn't for the faint of heart if you're running it 'raw', but if someone has made a profile for it, it's pretty much good to go.)
Also, just as a FYI: Many commercial anti-virus scanners, unfortunately, have other agenda as well and will flag software that companies have paid them to flag. (Windows Defender is remarkably light in this regard, but I prefer ClamAV.)
(Added some of this to the patcher's post.)