I'm going through the Installfest on my Windows 10 laptop. I had a problem with Step 5:
After I downloaded the 2.6.8 update and then ran the commands to install it in Step 5.3, it didn't update... even though it said it did. I closed and reopened the terminal and ran
gem -v, and it still showed the old version. I rebooted, and then reopened the terminal and ran
gem -v... still no update.
So I followed the directions here: https://rubygems.org/pages/download and ran
gem update --system. That worked, and I now have 2.6.8.
Hope this helps somebody else!