Epic is axing the Unreal Marketplace, Quixel Megascans, Sketchfab, and the ArtStation Marketplace to replace them with "Fab," an engine-independent asset store. (This seems like an odd decision to me, but it's not the main point of the post)

If you claim any Megascans once Fab launches, you keep them for free forever, regardless of where you plan to use them!

Fab launches sometime mid-October, and all Megascans content will be free until the end of the year, even if you're using Unity/Godot/Blender/etc.

Claim as many as you can! (Hopefully someone makes a script to claim them all or something, haha)

Unreal users will no longer have unlimited access to Megascans after 2024.

For the past 5 years, if you were an Unreal user, you could use all the Megascans you wanted for free without a subscription, but that'll be going away at the end of the year. If you don't claim them during this period, your free access to Megascans will be cut off.