Recent install of AC15, then updates, now AC15 wont launch

[Anonymous]

Recently installed ArchiCAD 15 to my PC. Also have current Norton Antivirus protection. After launching AC15, (in demo mode as I forgot my WIBUKey at home) a window from Graphisoft opened up telling me that there were (2) updates available to install. I selected download and run from both update item which, in turn, opened an installation wizard that installed both updates. I restarted my pc, and launched ArchiCAD. as the program starts to load I get an "ArchiCAD.exe: Start Error" which states "?GetSignalClient@ProjectConnectionManager@TWCB@@UAEPAVSignalClient@2@XZ not found. Function is not available in TWClientBase.dll!" . After clicking "OK", ArchiCAD closes. What happened?!

How do I get AC15 to reload, launch, and open again?

[Marton Kiss]

Ken,

I think your Antivirus protection blocked some files during the installation of the updates.
To fix this uninstall ArchiCAD, disable Norton AV, install AC, install the patches, enable Norton.
For safety reasons disable any network connections for the period when the AV is in disabled state.

Regards,
Marton