The Beta version (91.0.864.15) is identical to the current Windows 10 Beta version, suggesting that we will probably see Stable released mid-summer, possibly in conjunction with the next Windows 10 Stable release.
If anyone wants to test Edge without inventing a work-around installation and without having to commit to long-term self-maintenance as updates are released, Edge is available as a Flatpak:
(1) Install Flatpak if it is not already installed (it should be installed already unless you removed it).
(2) Install the Flathub BETA repository via the terminal, using these commands:
flatpak remote-add flathub-beta https://flathub.org/beta-repo/flathub-beta.flatpakrepo
flatpak install flathub-beta org.godotengine.Godot
(3) Install Microsoft Edge via the terminal, using this command:
flatpak install com.microsoft.Edge
The Github for the Flatpak/Flathub project is https://github.com/flathub/com.microsoft.Edge/
My understanding is that Edge will be moved from the Flathub Beta repository to the Flathub Stable repository when the Stable version of Edge is released. I've also seen some hints that Microsoft will release Edge as a Snap in due course, but I don't know that for certain.
UPDATE 5/10/2021: I received this note from the Edge-Linux Github lead today: "Correct. The Beta builds will stay in the Beta branch for those that want to use the Beta builds. Once the Stable comes out, we will create a Stable branch so Flathub can ship both Beta and Stable. However, we are still waiting for Chrome to transition to the stable branch of Flathub. That is because Flatpak already sandboxes every application, and sandboxing an already sandboxed application is a bit of a pain. Once everything becomes fully stable, that is when we will add the Stable branch." I'm not quite sure how the sandboxing issue plays out, but apparently the Edge-Linux Github team overlaps with a Chrome-Linux Github project.
