Huh... The !ml suffix means it's by machine learning, and this is a false positive. I've pulled it through virustotal.com and none of the 60 virusscanners flagged it: https://www.virustotal.com/gui/file/21719a5d0419bf963039df9cab0a1af882f4fc98fd5555631de45fe5c4b30239?nocache=1
So it's a bit weird why it is flagged by your system. I scanned the exe locally here with windows defender and it didn't flag it, it found 0 issues.
The main issue I think is that it's an nsis based installer. nsis is a general purpose installer program used by many programs and we use it since 2006 or so, it works great. Perhaps it flagged it because of that, no idea. If you right click the installer exe in file explorer -> properties -> general tab, is there an unblock checkbox? If you check that windows shouldn't block it anymore.
If you have 7 zip, you can unpack the exe as a normal zip file. Windows defender won't find anything inside it.
We could distribute the files to install as a zip too btw, if you prefer that.