If the computer is shutting off due to the processor overheating, we won’t be getting anything from the Windows Event Viewer so you can ignore that for now. Would it be possible for you to ensure that your cooling for processor is still working correctly? This sounds like a situation where the cooling is failing to do its job.
If you do get a chance, please try reverting to the previous version of the engine that you were able to use previously (What version is that?) and see if you still run into the same issues.
Edit: Also check on your power usage. This could be a power supply failure, as the GPU and the CPU could be using too much power. Processor overheating still usually results in a Windows BSOD but a power supply failure would result in exactly what you’re seeing.