I uninstall the xpack than reboot fsx. The sim error went away buy gsx was still missing from my add on.
First, if you use FSX:SE, you should NOT install or uninstall ANY of the Service Packs, since they are already contained in FSX:SE. The ONLY thing you should install, is the XPack/SP2 Simconnect client, which you don't even have to do manually, because the GSX INSTALLER will automatically install for you.
If, instead, you Uninstall xpack, as you said you have, NO 3rd party product that requires the XPack/SP2 Simconnect client, and GSX is one of them, will ever work.
Which means:
- Under regular FSX, if you uninstall either the SP1 or the XPack/SP2 for any reason, you MUST reinstall them.
- Under FSX:SE you should NEVER, EVER install ANY of the Service Pack, and install ONLY the XPack/SP2 Simconnect Client, which can be done even while installing GSX, because it will install it automatically.