If the replay is from an older version of LFS that has been rendered incompatible, you'll have to have a version of LFS that is compatible with that replay's version.
Unfortunately, obsolete replays cannot be handled efficiently in any other way without having to have multiple versions of the game code.
If you click on the replay in the replays list, it'll tell you what version of LFS it was recorded in. You can find older versions of LFS at https://www.lfs.net/archive
.Please fix it