We had installed CRM 2011 Server in Network Load Balance. The installation was successful in both the nodes (CRM Server). However later because of some reason we had to do the installation again. We uninstalled CRM from node 1 and did a fresh re installation there, which succeeded.
However our 2nd node of CRM 2011 was still referring to old installation. In node 2, we were not able to uninstall CRM using the add remove program features. The only option left with us was to manually uninstall CRM 2011 from that server, for which we followed the tips given in the following blog post.
Then we tried running our installer again. This time we got the following error
“The Product key is not compatible with installed version of Microsoft Dynamics CRM”
Which took us to following blog post
It suggested using Microsoft Update option that comes in the installer before proceeding. However doing so started giving the following error to us.
“The upgrade cannot be installed by the Windows Installer service because the program to be upgraded may be missing, or the upgrade may update a different version of the program.”
The solution that worked for us for fixing this issue was to get the latest installer of CRM 2011 Server from the download center and running the setup from there.
Hope it helps.