In MistikaVR 8.8.7 betas, when installing the activation code for  a subscription it is recommended to deactivate the previous activation code for the evaluation (if any), then reactivate the latest activation code and reboot the system. Otherwise you will have two licenses in the system and the software could use the wrong one.

The management of activation codes and licenses is explained in this document.

This will be done automatically in MistikaVR 8.8.7 final release (which is still in beta stage at the date of this document)