Hey there MrTeapawt.
Well its quite simple :)
Just follow these steps:
1) Go to your directory were the 100 Replays are located, I am guessing its "C:\games\Toribash-3.8\replay".
2) When you've found the folder, Copy every Replay in that folder.
3) Go to the latest version of Toribash you mentioned, Which might be "C:\games\Toribash-3.86\replay"
4) Paste the replays you copied.
A tip:
Delete your old Toribash versions because they might contain alot of memory in them.
Hope this helps
~blackshark.