If the popup windows disappear without asking administrative permission and Windows Subsystem For Android™ is not installed successfully, you should manually run Install.ps1 as administrator:
1. Redownload the WSA Build and rename the extracted folder to a shorter name, which can be anything to your choosing
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For example:
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Before: WSA_2XXX.XXXXXXX_XXXX_Release-Nightly-with-magisk-XXXXXXX-XXXXXX-MindTheGapps-XX.X-RemovedAmazon
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After: WSAArchive2XXX
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2. Copy the path of the folder by right clicking on the folder and select "Show More Options" and click on "Copy as path"
3. Press Win + X on your keyboard and select Windows™ Terminal (Admin) or Powershell (Admin) depending on the version of Windows™ you are running
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4. Input the command below and press enter, replacing {X:\path\to\your\extracted\folder} including the {} with the path of the extracted folder
cd "{X:\path\to\your\extracted\folder}"5. Input the command below and press Enter
PowerShell.exe -ExecutionPolicy Bypass -File .\Install.ps1
6. The script will run and Windows Subsystem For Android™ will be installed