Use either Command Prompt or PowerShell to generate an SHA-256 checksum.
Press Windows + R to open the Run box.
If using Command Prompt enter cmd and click OK.
Type in the following
certutil -hashfile C:\file\path\AwdabptPolyCurves_Setup.zip SHA256
changing C:\file\path to the path on your computer.
If using Power Shell enter powershell and click OK.
Type in the following.
Get-FileHash C:\file\path\AwdabptPolyCurves_Setup.zip -Algorithm SHA256
changing C:\file\path to the path on your computer.