Hi everyone,
I tried installing Patch 2 of the Mapping and Charting Solutions 10.2.1 yesterday and I was stuck in this problem wherein I CANNOT APPLY the patch to the current version of MCS installed on one of the machines. I was doing it in four other machines and I've got no trouble installing them in the other three. 
I used the same installer for the four machines. Any help is gladly appreciated.
Thanks,
L