You need two tech researches to finish the IndA bonus questline. The second is Modern Roads, which you'll have completed already; however before that you have to research a cultural building technology. If you have no cultural building researches left in PME (or an earlier age), you won't be able to complete the Industrial bonus questline and it's better not to start it. This just means not completing Las Penas. You can still do "Canada" and "Mexico".
If you have enough saved researches, you should do the old method of reaching the hovers, aborting the quest Truth or Dare towards the end of PME. The newer method of leaving Truth or Dare open will also lose you an RQ slot.