UE4 has always had pretty high requirements so even the first release would not work. There’s a Mac version of UDK (based on UE3) but there’s no download available for it anymore.
Laptops can’t get upgrades for GPU’s, you would have to get a new system that has more power. Windows desktops can be easily upgraded though if you want to go that direction. Here’s the recommended hardware: A new, community-hosted Unreal Engine Wiki - Announcements and Releases - Unreal Engine Forums