There are no crash files, only Kernel Files with .gpuRestart. After that Kernel process where the coloured Wheel spins the complete System freezes and i have to press the power button to restart the whole system. I found out, that this issue happens on my Macbook Air with Mojave, as well with my Macbook Pro with Yosemite after updating to the newer Affinity Apps. Beforehand i had no Problems with both and even on my less powerful macbook air, the applications were working fluetly.
One week ago i installed Affninity Photo again after removing the application from my harddrive, but with no change.