I tried this file with the trial Pro 2021 but only Page A-1 layout shows with no option to go to Page 0 which is the Default Page Template. That confirms David's answer that the other layout files can not be opened. The floor levels are showing indeed. It still gives me a fighting chance but where would I find those files created by X12 such as Schedules, Notes, Wall Framing, etc. to copy and paste to Pro 2021? I have to call Chief on Monday to ask if my intentions are possible.
If I remember, I just printed my file to 200% then but not all printer can do a scaled print. Not even FedEx Kinko's, they were always off when measured. There were so many wasted sheets.