Hi @Atom. You’ll want to try cached versions of threads to retrieve your old sig links. Search engines are good for this in the short term.
Old links work via redirect. For example:
https://blenderartists.org/forum/showthread.php?273033-Sculpting-with-UVs-and-displacements resolves to:
Sculpting with UVs and displacements.
Not sure why the thread numbers changed though. 