Swift Browser deleted from the Microsoft Store

Same Issue here.
the readme mentions a chromium version so they're probably waiting until that's available to release instead, since EdgeHTML is officially considered dead
Should be downloadable via store.rg-adguard.net, the ProductID of SwiftBrowser is 9P9B4P80TFB5, and choose the Retail ring.
Looks like 0.19.32.0 was the latest Windows version of the app before it was removed from the store. (to download files, you need to right-click, save as, since they are offered from Microsoft's servers over http instead of https).
So, the right file to grab is the 2505FireCubeStudios.Swiftbrowser_0.19.32.0_neutral_~_k45w5yt88e21j.appxbundle file.
Fair warning though, it definitely is quite out of date.