1)Initially I have 4.2 version of FDM in server. Later I installed 4.9 version of FDM in different folder. But 4.2 version present in desktop is been replaced with 4.9 completely. Is it not possible to install two different versions of FDM in single server.
2) Since 4.2 is replaced with 4.9 completely, I tried installing 4.2 again but facing issue like Already most recent version is available. How to install older version(like 4.2) in the server when there is already new version(like 4.9) present.
Release : 4.9
Component : CA Test Data Manager
Generally installer identifies the existing installation and do the upgrade. So, we can not install/maintain multiple versions on same machine.
If you want to use multiple versions, take a copy of FDM installation to different directory (say FDM_4_2) and then proceed with installation of 4.9. So that, you will have both versions of FDM's in your local.