There was a similar post on this here:
They suggested to remove the extension. It shouldn't hurt anything to do this if you can't find the updated version at this time.
Looking at the DLP supported platforms, 9.4.3 is currently TBD on the release date. I would suggest upgrading to another supported version, 10 patch 1 or higher. Depending on what version of DLP you're upgrading from, this might be a direct upgrade.
I have it in my Grant area, it's not in the default visible area though. Login to your Grant -> your Product group -> All Versions at the top -> McAfee Device Control 9.4