Error: TSM Client not installed (could not load tsmapi.dll) on server_name when backing up with LiteSpeed maintenance plan
While a 32 bit instance of SQL will work on a 64 bit box. Litespeed will look for a 32 bit TSM client..which doesn't exist. The issue may occur on all versions of SQL Server. LiteSpeed is attempting to match the bit version of the tsm client to the bit version of the instance.
WORKAROUND:
Upgrade the instance to SQL Server 2005 (64bit).