Back up your Geometry Dash save data first
Uninstall Geometry Dash 2.208
Get the 2.207 APK from a trusted source
Enable installation from unknown sources on your device
Install the 2.207 APK
Do not open the game until the install is complete
Restore your save data if needed
Disable automatic app updates for Geometry Dash
Launch the game and verify the version is 2.207