UPDATE: Never mind the question above. I found the following answer in some other search results:
"When you are in doubt as to which version of the Milestone Integration Platform (MIP) Software Development Kit (SDK) will work with a specific version of the Milestone XProtect® software, a general rule of thumb is the following:
always use the newest MIP SDK when you develop a MIP application or a plug-in. (Note: For the latest available stable release of the MIP SDK for XProtect Professional VMS (E-code), check KB 20119.)"