Moving a Legacy Theme to RW7

I’ve been using RW for a long time, but only occasionally. I just upgraded to RW 7, and found that my heavily-modified Alpha (and renamed) theme did not export to RW 7. The site it’s used on is so large I have not had time to recreate it in something more modern, like Foundation. Anybody know a way to export that theme to RW 7?

Tried to export the original file to RW7 again, and it didn’t export the modified theme. Tried a third time, and it DID export the modified theme. Go figure.