Recovery Manager Exchange dropping DLLs

Is it common for RMEx to drop Exchange .dlls (even during the middle of a search/restore)?

Every install of RMEx seems to lose the dll files after a short period of time and they cannot be re-added without reinstalling.

Strange thing is, if I select to add 2016/2019 Exchange DLLs, and link the folder that had 2013 DLLs, a message says they cannot be added because these DLLs are for 2013 (Cool, so RMEx can see the DLLs). But If I select Exchange 2013 version and link the 2013 folder RMEx tells me there's nothing there (So now it can't see them), but a with a reinstall it finds the files and works until they inevitably drop again.