From the ICPSR FAQ: 

If your institution's Official Representative (OR) has provided us with the IP ranges for your institution, you can access data from home, but you first have to login to the ICPSR website from on campus. Once you do so, your MyData account is validated for off campus downloads for the next six months. Every time you log in to the ICPSR website from on campus, that is extended another six months.

In the event that you cannot get on campus (for example, you're on sabbatical), contact help@icpsr.umich.edu. We'll check with your OR and then manually validate your account.

For additional assistance or questions, please contact Pitt's Official Representative, Christopher Lemery, at clemery@pitt.edu.