Why do you need an older version?
Do you have to work in that version, or is it just to open an old file.
Current versions can open any file back to version 10.
If you need to access files older than 10, there are file converters that can do that.
Pre version 17, the software was distributed on discs and not digitally.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10