Not sure about this, but you may be able to run the 180-day trial as much as you want, as long as you're willing to reinstall every 180 days. I installed the 20

Not sure about this, but you may be able to run the 180-day trial as much as you want, as long as you're willing to reinstall every 180 days. I installed the 2008 and 2012 trials several times over the years and got the full trial each time, but I haven't tried it back-to-back after expiration.