Bad idea mate 
Once you launch the sim for the first time, you’ll have the choice to select the Install Packages Path . If your C: drive is small, you can install the official packages (more or less 100GB depending on your version) and the community packages on any drive of your choice (for instance the D: drive).
How to move MSFS from old hard drive to new SSD - MS Store ver.
1 create new folder named MSFS 2020 on for e.g. D drive // D=new SSD
2 copy Official and Community folders from
C:\Users\YourUsername\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packages
and paste to D:\MSFS 2020
3 after that go to
C:\Users\YourUsername\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache
4 in notepad open file named userconfig.opt
scroll down to the bottom and edit last line
e.g.
InstalledPackagesPath "C:\Users\YourUsername\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packages"
// Packages is root game folder
// D = new SSD
change
InstalledPackagesPath "C:\Users\YourUsername\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packages"
to for e.g.
InstalledPackagesPath "D:\MSFS 2020"
save changes
After that go to
C:\Users\YourUsername\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packages\Official
delete all files and folders
Go to
C:\Users\YourUsername\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packages\Community
Delete all files and folders
How to move MSFS from old hard drive to new SSD - msfs Steam ver.
1 create new folder named MSFS 2020 on for e.g. D drive // D=new SSD
2 copy root_game_folder Packages from
C:\Users\YourUsername\AppData\Roaming\Microsoft Flight Simulator
to D:\MSFS 2020
3 after that go to
C:\Users\YourUsername\AppData\Roaming\Microsoft Flight Simulator
4 in notepad open file named userconfig.opt
scroll down to the bottom and edit last line
e.g.
InstalledPackagesPath "C:\Users\YourUsername\AppData\Roaming\Microsoft Flight Simulator\Packages"
// Packages is root game folder
// D = new SSD
change
InstalledPackagesPath "C:\Users\YourUsername\AppData\Roaming\Microsoft Flight Simulator\Packages"
to for e.g.
InstalledPackagesPath "D:\MSFS 2020\Packages"
save changes
After that go to
C:\Users\YourUsername\AppData\Roaming\Microsoft Flight\Packages\Official
delete all files and folders
Go to
C:\Users\YourUsername\AppData\Roaming\Microsoft Flight\Packages\Community
Delete all files and folders