Copy your Assets and Content folder form old to new PC and everything should be there.
Some payware might need anonther install after this so the DRM works correctly agian. (eg christrains)
Also wise to copy the manuals folder, but it's not nessecary.
If you only want the NWnl v5 route, you should find in inside the content folder and oly copy that. But finding the needed assets in the asset folder might be a little difficult.