As you are using ALM 12.20, that limits your selection for Sprinter. As it stands, you only choice would be Sprinter 12.20. You cannot use a higher version of Sprinter with ALM 12.20.
If though you decide to patch/upgrade your ALM 12.20 to ALM 12.21, you would then open the door to using a more recent version of Sprinter. ALM 12.21 will support use with Sprinter versions, 12.50, 12.52, 12.53 and 12.54. Though some patches for ALM 12.21 will be required for the latest Sprinter releases.
Always remember to check out the associated readme file for each Sprinter release first. The readme files will list what versions of ALM are supported (version and patch). Best way to check to make sure everything is compatible before attempting an install.