www.makemkv.com

No need to replace OpenSSL. Keep the F26 version. Only need to replace the F26 version of MakeMKV (and mmdtsdec..) with the F25 version. Simplest to just d/l the RPMs from the F25 repository, and then use # rpm -Uvh <rpmname> --force --nodeps

Problem is with the Fedora 26 version of MakeMKV. Workaround is to (force..) install the Fedora 25 version, which works correctly.