In normal circumstances DESlock+ can seamlessly upgrade a Full Disk Encrypted (FDE) workstation.

In some rare cases, disks encrypted with older versions of DESlock+ will need to be decrypted before upgrading. The installation will detect and prompt when necessary.

Decryption will be required in either of the following two cases:

• The installed version of DESlock+ is older than 4.1, which was superseded in August 2011.
• The pre-boot authentication screen shows a version of 0.78 or older. This can only happen if the installation used to Full Disk Encrypt the system was older than v4.1.13.232 (released in February 2011).