Is it possible to install over a SSD and HDD? My SSD is full?
Did you want to get a bigger SSD or, are you adding an HDD? And, are you booting off of an HDD or SSD? Not sure what you’re asking. One of the best tools to clone a drive(s) is Acronis True Image.
My current SSD is full… Want to get another SSD instead of putting the sim on HDD(As I have heard it causes performance issues…) Will I have to reinstall the sim on the bigger SSD? My update wouldn’t complete on my current SSD because it still needed 8Gb of space (That it didn’t have)
you can get a bigger SSD then use a clone software to make a copy of your old ssd to the new one. when done boot from the new drive…
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
better is fresh install 
lolz
Waste of time 
the OP asks if ssd + Hdd is an option , putting your data files on a slowwwww disk i would not advice.
lolz 2 SSD’s i need more coffee.
But then again if OP buy’s a bigger SSD then it’s better to have that one running the OS and then have more room for a bigger pagefile.
Size matters
I can move pagefile.sys to another SSD without any problems
Edit
HDD is bad idea.
Try disk cleanup
How to
In windows search bar type
disk cleanup
Right click on it and select run as administrator
Select disk C and click ok
On the disk cleanup tab select all check boxes
Click “more options” tab and under “system restore and shadow copies” click “clean up”.
Click delete
Click “Ok”
If you don’t have a location to mount the new SSD, but do have an empty PCIe x16 slot, they make m.2 adapters for the PCIe x16 slot which take full advantage of the speed of hi-speed SSD’s (i.e. Rocket Sabrent). I’m using two 1TB Rockets and it’s working great for me, one on the motherboard, and one in an adapter. They’re very inexpensive.
Make sure they match the model you’re purchasing (mine were NVMe 2280 at the time a couple of years ago)
Hi all, is it possible to add another SSD and just move the community folder to this new SSD?