Unofficial versions often crash or corrupt database files. There is nothing worse than losing months of data entry because of a faulty license bypass.
If you have already purchased the key but Memento still appears as "Free," consider these common fixes: memento database pro license key
: Enhanced integration with other apps and services, as well as more flexible syncing options (including perhaps integration with desktop versions or other devices), can be part of the Pro package. Unofficial versions often crash or corrupt database files