Hi... 

Here is my thoughts about this new feature request.

Currently I am only able to install one version per linux server... I know we can do the tar/untar of executable but its a bit messy to do that but doable.

I like to be able to install multiple versions of mongo 2.6 all the way to mongo 4.0 on a given linux server and perform the upgrades/downgrades etc.. without the need to uninstall and reinstall the versions.