An SHA256 checksum file is available on the CloudBees downloads site. If you choose to verify that the install files are intact and unaltered from their original form and content after you download them, download the corresponding SHA256 checksum file also.
SHA256 utilities are available for supported operating systems.
On Linux, verify with
sha256sum --check <filename>
Most Linux installations provide an sha256sum command for calculating SHA256 message digests.
On Windows, run
certutil -hashfile <filename> SHA256from the command line.