Is there a tutorial on how to install MMM to another drive besides C:\ ?
I certainly don't know of one but, during the installation process you will see a screen that says something like "Accept Default Installation settings" (can't remember the exact wording, sorry!) It's easy to miss this so check carefully each screen that appears.
If you click on that statement a screen opens where you can select where to install MMM. In my case, it is entirely successfully installed on a drive, D:\, devoted ONLY to Programs.