UE4 crashes upon start up

Okay so im Using the Source Control Version OF UE4 and it has only started to crash on start in the last few weeks. it goes to load the project up and then crashes at 93%. i have emailed the support team and they told me to come here to ask because “In taking a look at your logs, and you using the source control version this issue is out of my expertise. You will need to post on AnswerHub so that our Engine Support Team can assist you further. I am very sorry for the confusion on my part.” so i am here im not sure whats going on. ill upload the same things they wanted. please help me