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Please see the official X‑Plane Support page for help.
I've just updated the Steam client this morning (9 nov 2018) on my iMac (10.10.5) and X-plane won't start anymore. Clues?
Here's my Crash log
Problem was on OSX 10.10.5 Yosemite. After many attempts and re-installments, I was forced to update to Mojave. This allowed me to open Steam again, but the new OSX slowed down overall performances dramatically
This site is no longer being actively maintained.