License key operation failure: DT.7: The maximum number of server(s) can be installed with this serial number has been reached.

You must release your license. 

You can learn how here: https://store.litespeedtech.com/store/index.php?rp=/knowledgebase/70/How-do-I-migrateorrelease-my-license.html

  • Release, License, Server
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