What a checksum is
A checksum is a value calculated from a file. If the file changes, the checksum changes. Software publishers use checksums to help users confirm that a downloaded installer matches the published release file.
A checksum does not prove that a company is trustworthy by itself. It proves that your local file matches the checksum published by the source you are trusting.
How to check SHA-256 on Windows
Open PowerShell in the folder where the installer was downloaded. Then run the Windows file hash command against the downloaded file.
Get-FileHash .\ZBEVPN-Setup-Online.exe -Algorithm SHA256
Use the published ZBEVPN checksum page or raw checksum file to compare the value. The two values must match exactly. A different value means the file should not be installed.
What to do if it does not match
Delete the downloaded file. Download the installer again only from the official ZBEVPN portal. Recheck the hash after the new download. Do not bypass a checksum mismatch.