Can I even open ORD files with GPK SS10?

I have been given some files and told to "make some sheets".

The files I have been given come from ORD V10.10 (I believe).
I have Geopak SS10.

I thought I might be able to use these files as references, despite the disparity in version. I'm not sure, though. I attached one of the design files as a reference and tried to adjust the level display (Global Freeze) of that reference. I then got a dialog telling me that "opening this file would downgrade the data". I don't want to do that, so I selected "no", but then Geopak just closed. I'm not trying to open the file - just attach it as background only.

Should I be able to attach an ORD file to a SS10 file as a reference?
If that's supposed to work, What else could be going on that tells the software I am trying to "open" the file?

I do have ORD 2020 R2, but I haven't done any setup for this particular DOT configuration because I was told we weren't pursuing work there. Apparently we ARE pursuing partnerships with their clients...but I don't think I can get the standards up and running before the deadline for tomorrow noon. (Heck, I can't even run the installer because I need IT to give permission to run any executables)

I do hate that contracts are often negotiated without consulting the technicians...It's never as easy as the folks in the offices think it is.