Just tried installing this and Windows 10 built-in AV is blocking it (LorbyAxisAndOhs_Install_MSFS.exe) due to "Win32/DefenceEvasion.A!ml - This program is dangerous and executes commands from an attacker".
I've been using AAO for years and never seen an AAO update blocked before.
I've just tested dragging the MSFS2020 exe installer from 4.52.b39 and 4.53.b19 from the zip to the desktop and they're both fine, whereas doing the same with 4.54.b08 it's an instant block/quarantine.
I've also tried to drag all the other exe installers (MSFS24, Xplane, etc) from 4.54.b08 to the desktop and they are all fine, so it's just the MSFS2020 installer that's affected.
My download source is JustFlight.