Addon Manager Will Not Activate GSX Expansion

[signmanbob]

Hello,
I purchased the GSX expansion and I am trying to put my serial number into the Addon Manager to activate the produce, but when I push the "Register" button the Addon Manager disappears and I go back to the sim.
I notice that when I try again, the Addon Manager has moved to the bottom of the list.
I have installed the newest Addon Manager.  How can I get this product activated?  It is still showing "Trail Mode"

Thank you,
Bob

[MrFickles]

I have the same issue. All my FSDT products are in trial mode and can't be activated. Inputting my serial on addon manager does nothing and the products stay on trial mode.

[Prluey]

Had the same issue.  I uninstall all of the FSDT products and reinstalled them.  Seems to be working fine now.