In https://discourse.julialang.org/t/looking-for-feedback-from-users-that-currently-cant-install-juliaup-from-the-windows-store/85507 by @davidanthoff, you can see
/quote
If you are a Windows user who currently can’t install Juliaup from the Windows Store, please continue reading and consider helping out 
I have a new setup option for Juliaup on Windows that might work for users where the Windows Store option is currently blocked or broken. If you can, please consider trying that option out (instructions below) and reporting back here in this thread or over at Alternative to Windows Store for Windows · Issue #343 · JuliaLang/juliaup · GitHub .
To try this option, download https://install.julialang.org/Julia.appinstaller and then launch the downloaded file.
Small warning: this new option is quite experimental, and some things don’t work yet. I don’t think any of that is in any way serious, just be prepared for a slightly bumpy experience and don’t try this if you have a deadline coming up. You might also have to uninstall and reinstall at some point during the test phase.
/end of quote
Hope this help