Friend, it's not because YOU didn't have any troubles in YOUR projects, that he/she won't.
Romullus is right, just don't switch this project if there isn't anyhthing extra you might use, copy past the file when done and save a new file for the new corona version and see then if you are good to go or not.
Kudos to the development team, I don't THINK you'll have problems. But if you do, reverting is a pain in the ass, if it's even possible.
EXTRA: I just saw they added 14 extra days if you switched to the 2 version, to your trial.
"For those of you who have tried Corona before and your 45-day trial expired, we've automatically refreshed the demo period to give everyone an extra 14 days so you can try out all the new features! Simply download and install Corona Renderer 2, and you can activate the refreshed demo period right from within 3ds Max. Enjoy!"So mayby if you can finish the project before your trial ends, install the 2 version and get an extra 14 days to try it out.
https://forum.corona-renderer.com/index.php?topic=20838.0grts