BPC 7.5MS Client and EPM (BPC 10.1MS) working on the same excel

Hi All

I am trying to get BPC 7.5 MS Client and EPM Client (BPC 10.1MS) working on the same pc.

When installing both clients, BPC 7.5 works but when logging onto BPC 10.1 I get the following error : The type initializer for 'FPMXLClient.Common.SAPPassportHelper' threw and exception.

I have tried installing BPC 10.1 first (Which works perfectly without 7.5) , then installing BPC 7.5 after. BPC10.1 EPM stops working once 7.5 is installed.

Any suggestions on getting both versions to work together?

Regards

Aadil