Hi Robleau2,
Generally speaking, it is the responsibility of modders to keep their links up to date. Occasionally, players will be able to supply a re-upload, but sadly this is not often.
There is no practice in which dead mods/dead links are removed by moderation or administration. Furthermore, for mods or admins to check through each mod (periodically) would be very time consuming. Possibly, this practice could be reconsidered and applied on an ad hoc basis; i.e. if a player, such as yourself, comes across a dead mod/dead link and presses the Report button to bring it to staff's attention. You could make such a suggestion
here. The issue would be, though, if a modder or player eventually comes along with a re-upload.
You could check the last couple of posts on each mod. Generally, you will find players posting requests for a re-upload if a link is dead, which might be quicker than starting at the start of the thread.
You can check the
Modding Vault to see if a specific mod has been backed up by TWC in the past, though I believe the project may currently be dormant.
Hope this helps somewhat.
Frunk