Open a old file with an old version

[AOR]

I work with Archicad 25.

I've 3 keys (2 physical - 1 internal)

I would like to open old Archicad files with Archicad versions (10 - 13 - 14 - 15). With these keys I cannot. How should I do?

Thank you for your answer

AOR

[Lee Hankins]

Which operating system do you use? You can open old file types in the newest Archicad. I believe Archicad 25 will open any file all the way back to Archicad 10 you just need to make sure to load the migration libraries too. Older versions of Archicad will unlikely function properly on more modern operating systems. 

[vistasp]

Your licence for v.25 means you have all the previous version licences too.

What exactly is the error message you're seeing?