I downloaded the demo version on my iMac (21,5" end 2009, OSX Yosemite, v10.10.5, 3,06 GHz, Intel Core Duo 2, 12 GB RAM, NVIDIA Getforce 9600 256 Mb) of X Plane 11.
It is definitely unusable and as sson as it is finally loaded, it is completely stucked.
Maybe my computer unfit the minimum requirements although I did not find something specific about it.
Any suggestion?