Many universities teach biomechanics using Visual3D. To make it easier for classroom use HAS-Motion created a special Student Version account that provides temporary copies of Visual3D for use by students, collaborators, or university teaching labs.
If you are an existing Visual3D customer (or buying new Visual3D licenses) and you maintain the yearly technical support ($1250 USD per year), then you may purchase a set of 5 temporary licenses for student use that will expire in one year.
The Student Version is a fully functional copy of Visual3D, but it is accessible only from a separate download account that is linked to a primary Visual3D account.
If the support on the primary account expires, then the student account is disabled too.
The minimum number of student licenses is 5, but more can be purchased.
You must buy a new set of licenses each year because they are temporary licenses.
You cannot get a student version if you are not a customer. You must buy Visual3D first. You cannot get less than 5, but you don't have to use them all.
If you have problems with Visual3D, see if your issue is covered on the general troubleshooting page here.