RepliStor will not accept license key

Earlier in the year, one of our customers upgraded from RepliStor 6.1.2 to 6.2.3 on their primary and backup nodes. As a result, the same license key could be used during the upgrade. Both nodes have one processor each, so I believe that they have Workgroup licenses

For reasons currently unknown to me, RepliStor has had to be re-installed on their backup node. The primary node is fine and untouched. All previously defined specifications between the nodes were removed prior to this. When it came to entering the license key (the same one they had before), RepliStor complained that the key was invalid and would not accept the key.

I have been informed that even though RepliStor can be completely uninstalled, it still holds license information in the form of a s0f5b.gid file in the Windows system32 directory. Deleting this file can enable you to enter the key you had before. After a reinstallation of RepliStor 6.2.3, this was done yesterday afternoon and the existing license key was accepted.

Now this morning, RepliStor has generated warnings the license key is invalid again. Another valid Workgroup license and a valid Enterprise license key has been entered and it is still refused. The odd thing is that the registry is updated with each license key entry, but for whatever reason, RepliStor will not accept the keys and is still running on the evaluation license.

Has anyone come across this before?