Although many users previously used one lifetime key on multiple PCs, Malwarebytes began strictly enforcing a 1-PC-per-license limit starting with version 3.8.
to prevent loss of the "paper" records and to manage device deactivations. 3. Retrieving Lost License Info
Lifetime Extra Quality - Malwarebytes 3.8 3 Premium
Although many users previously used one lifetime key on multiple PCs, Malwarebytes began strictly enforcing a 1-PC-per-license limit starting with version 3.8.
to prevent loss of the "paper" records and to manage device deactivations. 3. Retrieving Lost License Info