If you are on a Windows machine, you can use the Windows Event Viewer to track what is crashing it.(click on Windows Logs->Application)
Another option is to increase the allocated memory In the Adobe software, by going to Adobe Premiere or After Effects -> Edit -> Preferences -> Memory (I always leave 2GB for other apps and the rest for Adobe apps)
Also, the best option is to contact the template author, maybe he can help, although Envato Elements subscriptions do not come with support.
A method I am using successfully to boost speed, memory and rendering is the one described here, for me it works: https://www.youtube.com/watch?v=QoKVRzszohI&t=210s
Videohive authors will also help better with this, I’m convinced