LaunchPad changed, how to update old mods?

Vitdom

I haven't had time playing NS2 for a couple of months, and since LaunchPad has been updated during this time, it can't seem to find my old mods. How do I update an old existing mod on the Workshop on the same ID, or do I have to create a new one?

Feha

I had the same issue when returning after a long time, but the info was luckily very easy to find by simply searching the forums for "launchpad id" or "launchpad new"
http://forums.unknownworlds.com/discussion/130097/porting-mods-over-to-the-new-launchpad