Students weren't unable to complete exams; they were unable to upload the exams, which you need to do after you get home (or to a hotel) after the exam. It gets stores on your laptop (presumably with public key encryption) in the meantime. Examsoft's servers ran at least 50% slower than they had in the past; the company hasn't announced why.
The only trick is that some jurisdictions required you to upload the exam within a few hours, so Examsoft had to contact those jurisdictions and get them to extend the deadlines.
The only other issue is stress. If it takes law students a lot of time to deal with Examsoft's incompetence and they have to take day 2 of the exam the next day, people who needed just another hour of studying (Not many where an hour would make a difference, but there will be some who just barely fail)... the result, predictably, will be lawsuits.