Just to let you know, here’s today’s note from Andy (the lead developer):
FYI, i’ve removed ALL the 1.7.50.x releases until I can get a handle on the safe-upgrade issues that we’ve been having. This was intended to be a better upgrade system for Grav, but it’s actually been a nightmare, and is causing more issues than it solves. The next version will be a 1.7.51 release with these issues sorted 
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