TWClassic and TiddlyWiki v5+ have very different internal architectures. *None* of the plugins for TWClassic will work in TiddlyWiki5.... at least, not without being completely re-written from the ground up.
Fortunately, many of the previous TWClassic plugins are simply no longer needed in TiddlyWiki v5+... because the functionality they provided is now part of the TWCore code. Unfortunately, TiddlyLock is *not* one of those plugins... in particular, because it is includes to "file I/O handling", and most modern browsers now block direct local filesystem access due to security issues.
Important note: The above applies to the *stand-alone* version of TiddlyWiki. If you are using nodeJS, TiddlyFox, or TiddlyDesktop, there *is* some support for direct local file system access, because each of these applications is installed and run locally, and can request access to "priviledged" file I/O functions.
Another important note: the nodeJS usage stores individual tiddler as separate files. This permits multiple users to simultaneously make changes to *different* tiddlers without a problem. However, I don't think that nodeJS *currently* handles "collisions" when two people try to update the same tiddler at the same time: any changes saved by the first person will be overwritten when the second person saves their tiddler changes. Whoever saves last, "wins".
Sorry I couldn't provide a more useful answer...
enjoy,
-e
Eric Shulman
TiddlyTools / ELS Design Studios
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