I've been using the Technic Pack launcher to play the Technic Pack for the last few days. The launcher said there was an update for Sprout or something like that, and I pressed the OK button.
When I went into my world, all the mod items were missing: in my chests, in my inventory, and even placed blocks. I tried recovering from the backup, but the saves folder wasn't there.
I've lost probably 20 hours of work! What can I do?