Mudbox Ext 1 download?

[cyberbullet370]

I have a computer in class that I work on that has Mudbox 2016 and the Ext 1, but on my personal computer I don't have the Ext. Where can I get the Ext? I need it because when I try to open up projects that I have been work on in class on my personal computer it says that the version that I save with is newer and so I can't open up the file or do anything with it. Can I download/install it? If its really obvious then I'm missing it and would appreciate any help that can be offered. Thank you!

[MatthewDoyleArt]

Which version of Mudbox do you use? Student version or commercial ($10/month)?

In Mudbox, if you click on the Help menu at the top, there is a Check for Updates option. Does it have an option for you to upgrade? If you are licensed (either as a student or commercially) it should allow you to update.