Engine Crashes on Luanch, OSX 10.13

No versions that i try to install will launch on my Imac. I am using an Imac with 12gb Ram and a ATI Radeon HD 4670 256 GPU. I have tried uninstalling everything and reinstalling, and have tried multiple different versions of the engine but each time it tries to start then exits and launches a crash report. I will add The crash report files if i can.

Any help is greatly appreciated

Thx

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