Good day! The problem is the following: P3D v5.2, extreme, Win 10 x64 Pro. The antivirus is NOT installed
Are you sure don't have any antivirus installed, not even the default Windows Defender ? That's requires configuration just like any other 3rd party antivirus, if only to speed up loading a lot.
I have already reinstalled the GSX three times (the first part, since I did not purchase the second).
The installer is only one so, you have installed both GSX and GSX Level 2, just the Level 2 will run in Trial, until purchased.
When you select Add-Ons - Couatl Live Update - Check Live Update in the menu, the message "The remote server returned invalid data" appears.
This is only a temporary issue with our notification server, which won't have ANY effect on GSX, just the automatic notification inside the sim. But that doesn't mean "running the FSDT Live Updater", the "Check Live Update" option ( when it works ) will NOT update anything, it will just TELL you if there is an update.
The FSDT Live Updater is an *external* program that has its own Desktop icon and it's run separately when the simulator is not running.