I need to move MSFS off of my C drive, need help

You might take a look at the following link.
https://flightsimulator.zendesk.com/hc/en-us/articles/360015910560-All-versions-Can-I-choose-or-change-the-installation-path-Install-on-the-D-drive-instead-of-the-C-drive-for-instance-

Moving to a new drive is a ways down the page.

Take a look at this thread for another way to move to another drive.

Regards