If you perform a repload on a DB2 database that contained an ITP/MDK Repository installation before, repload itself or an installation/upgrade step after that may fail with the message that table T2000OLD already exist. The message may mention another table ending in "OLD". This will happen if an upgrade to 3.5.10 or later has been performed on the previous content of the database, and the cleanup step afterward (Cleanup for DB2) was not performed.
You can solve this by removing the tables mentioned in (Cleanup for DB2) and performing the repload again. Alternatively, you can create a new database and do your repload into that one.