Your ListManager license controls what version you may run or the date up to which you may upgrade your ListManager version. To determine if you are allowed to upgrade to the current version of ListManager, check Max Version and Last Day to Upgrade in Utilities: Administration: Server: Operational Statistics: License Capabilities.
Back up your database and test before upgrading. If you encounter a problem while doing the actual upgrade, you may not be able to recover your data without a backup.
Choosing the Correct Upgrade Process for Your Version
The upgrade process to ListManager 10.0 varies depending on which version you are currently using. To view the correct information, click the version you are upgrading from:
9.0 8.0 7.0 6.0 5.0 9.1 8.1 7.5 6.1 3.0 to 4.2.1 9.2 8.5 7.6 1.0 to 1.2 9.3 8.8 7.8 8.9 8.95