Right-click the FL Studio shortcut
Select Properties
Open the Compatibility tab
Check Run this program as an administrator
Click Apply
Click OK
Repeat for the FL Studio executable if needed
Right-click FL Studio.exe
Select Properties
Open the Compatibility tab
Check Run this program as an administrator
Click Apply
Click OK
If the option is unavailable, click Change settings for all users
Check Run this program as an administrator
Click Apply
Click OK
Launch FL Studio using the updated shortcut or executable