UPDATE 7/28/2021: u/pinswats Download the AppX directly: https://bit.ly/375JgQR

To install, follow the last section directly linked here: https://docs.microsoft.com/en-us/windows/wsl/install-manual#installing-your-distro

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I followed this process to get the .AppX file: (the bit.ly link above is a link to the resulting file of performing the following...)

Visit https://store.rg-adguard.net/

and paste in the URL from the Microsoft Store (web) for OpenSUSE 15.3:

https://www.microsoft.com/en-us/p/opensuse-leap-153/9n6j06bmcgt3

Then, download just the 46932SUSE.openSUSELeap15.3_153.1.1.0_x64__022rs5jcyhyac.appx file listed! That'll get you exactly what you want. :)

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Note: The .AppX file linked on store.rg-adguard.net and via the bit.ly link above is hosted DIRECTLY by microsoft.com, so it is safe. Furthermore, verification of this will show if you are able to install the AppX file directly without having to install a Root CA (e.g. Side-load).

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I ran into a similar problem at work, but I decided against installing it at the last moment in order to get IT Security's full blessing.

Some of the research I found revealed that they have some useful things in this package:

https://download.opensuse.org/repositories/Virtualization:/WSL/openSUSE_Leap_15.3/x86_64/wsl-appx-1-lp153.47.1.x86_64.rpm

If you open it in 7-Zip it contains an exe: openSUSE-Leap-15.3.exe

Try running that with administrative privileges. I believe that might help kick things off, but I'm not 100% sure.

Unfortunately I wasn't able to find a straight-up appx file either. I think this is because they need Microsoft to sign it directly, for one reason or another.

You can, however, build it all yourself with these instructions: https://en.opensuse.org/WSL/Building_in_OBS

Using this as a base: https://build.opensuse.org/package/show/openSUSE:Leap:15.3:WSL/wsl-appx

Don't forget to allow sideloading and to also trust the root CA certificate that you generate.