Caution when you download files in the internet.
Verify it using certutil utility and compare the result of MD5 hash to the original content, normally posted at the source website.
Open command prompt.
Type certutil -hashfile QUEFilename.txt MD5 to get the MD5 hash for the file QUEFilename.txt.
Sample result.
C:\que.com\security>certutil -hashfile test_server.ova MD5
MD5 hash of test_server.ova:
e5c750723e7029b19a501aa64QUECOMf
CertUtil: -hashfile command completed successfully.
For LINUX, open terminal.
sha1sum -c check_filename