I've just installed 2.9.1.17 on my PC (offline only), and the installer has triggered my virus scanner. This has happened with the last few versions as well, probably since 2.8. Detection happens during main install, before WinUSB driver install.
Installation continues normally after detection, and EOS runs with no problems.
I'll speak with our IT dept. as well, but thought I'd share with the forum too.
Tommo