If you ultimately need proof to submit your claim, it could be a problem for basically anyone but gonzo hoarders who save 14-year-old receipts for computers that are probably long gone. Once your claim is submitted you get a confirmation that says they will "send you additional instructions via email shortly after the claims deadline." That email will include "a variety of electronic payment formats including PayPal, Google Wallet, Amazon Balance, and others in order to receive an instant payment."
But before that becomes an issue, you should note you need to have been a resident of Arizona, California, District of Columbia, Florida, Hawaii, Kansas, Maine, Massachusetts, Michigan, Minnesota, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Mexico, New York, North Carolina, Oregon, Tennessee, Utah, Vermont, West Virginia, or Wisconsin to be eligible. For some states that are excluded, it's because they may have "a state law that differs materially from the federal antitrust laws."