In reply to Dewman1234:
Just to add on to the string of two year late replies, you can manually change the requirements. Open the file location through CurseForge, then navigate to: /saves/[your_world_name]/config/betterquesting/Quest Database.json. Scroll down to the quest (#252 to unlock Conductive or #246 for Leadstone), about halfway down the file and simply change the "Quest Logic" variable from "XOR" to "OR". The next time you launch your world, you'll see both jetpack progression lines unlocked.
I'm 90% sure of the file name, but I'm writing this on my phone and purely from memory so it may be wrong. Just pick the betterquesting file that refers to the quests with words and not numeric addresses.