Hello Martim,
Please double check IBM Upgrading DB2 V9.5 to higher versions on Windows platform fails with the error "DB2 has been installed prev…
It mentions the following regedit entries:
[HKEY_LOCAL_MACHINE\SOFTWARE\IBM\DB2\Elevated]
[HKEY_LOCAL_MACHINE\SOFTWARE\IBM\DB2\InstalledCopies\<COPYNAME>\Elevated]
Regards,
Ning Tong