Navigate to Windows Settings > Update & Security > For Developers. Shortcut: In Windows 10, open the Start menu and type "developer". "Developer settings"should be the first search result.
Enable "Developer Mode", wait for the process to complete, and close the Settings window.
Navigate to the beta download page and click the "Download" button. Note: Attempting to use the "Open with" option will cause issues. Be sure to "Save File".
Click "OK" to begin the download. The screenshots below refer to Measure Mobile, but this process is applicable to all Desktop App betas.
Navigate to the folder where the .APPX file was downloaded.
Right-click the .APPX file.
Select "Properties".
Open the "Digital Signatures" tab.
Left-click the signature that appears.
Click the "Details" button.
Click the "View Certificate" button.
Click the "Install Certificate..." button.
Select "Local Machine" from the Store Location box.
Click "Next". Note: Windows' User Account Control may display a prompt requesting confirmation of the operation. Click "Yes".
Select "Place all certificates in the following store".
Click the "Browse" button.
Select "Trusted Root Certification Authorities".
Click "OK".
Click "Next".
Click "Finish".
Click "OK" in the confirmation window and close remaining "Certificate" windows as well as the .APPX file's "Properties" window.
Run the .APPX file and follow the on-screen instructions to install the app.
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