Here's a [different] workaround I just used to resolve an Aatrix 'demo mode' issue (v2019):
Go into your local non-client Sage 100 system, click Activate button in lower-left in Aatrix (to essentially re-generate 'LastRegistrationDate' in the SY_FormsEfilingVersion file), and then manually enter the lastregdate value into the sy file on client's system.
Initially I had tried just copying in my SY_FormsEfilingVersion file which typically has worked for me, but not this time – but maybe cause I needed to first 'Activate'?
------------------------------
Brett Zimmerman
Net at Work
Greater Boston Area
------------------------------