Issue with SEP 12.1 in an SEPM 14.x environment

I recently update my SEPM to version 14.x.

For windows XP and W2k3 computers I use SEP version 12.1.7266.6800 MP8. But when I try to install a new exe packet with this versión I get an error in all my XP/w3k3 clients and that version is not installed.

NOTE: All these clients has already got SEP version 12.1.7004.6500 and are working fine with SEPM 14.x but I'd like to upgrade to the last 12.x version. I've tried to create the new packet with versión 12.1.7004.6500 but the result is exactly the same. The only packet I can install is that one created in my las console version, 12.1

Any help would be appreciate.

Thank you in advance.

This is the error I get

Jose Manuel García