Install Cis 11 : Error 1603

While installing CIS 11 (cispremium_only_installer v11.0.0.6710.exe) over my CIS 10 (cispremium_only_installer v10.2.0.6526.exe) I get Error 1603
It’s a Windows XP SP3 machine (I know … Don’t tell … there are reasons for it)
As I can see on the Comodo site CIS is still XP-compatible

What can I do ?
Is there a recent CIS10/CIS11 cleanup tool ?

Yep Official Comodo Uninstaller v2.0.0.3 Released just run the tool normally as an admin then when it fully completes try installing CIS again.

Thanks !
The tool solved the problem !