I am trying to a .odarc file into UPK and I am getting the following error:
The import file you have selected is invalid.
I am currently using version 3.1.7 the files are from a newer version of UPK. Can you import them into an older version?
Any help would be great.
As per Julian's response above, it is only backward compatible - older versions of UPK cannot import .ODARC files from a newer version.
I.e. UPK 11 content that has been exported cannot be imported into UPK 3.6.1, but it definitely works the other way around.