did that happen now for the first time or is it the first time you try it out? You can check the open source version and build the software if in doubt as well. Alternatively, right click on the installer and open with a zip program. Not sure what I can do hmm
It installed peacefully the first time. But hey, the anti-virus software is always updating itself, so it might be a new rule or something. If nobody else is seeing this, I'll chalk it up as a false positive.
