I am providing a link to the core ISO and one to the checksum text to compare after you download. This is unaltered and downloaded from the Zorin download page, generating the same sha256 key in the text file, the others are what is generated from Sha1 and md5. Zorin OS official page offers only the sha256. Since this matches, the MD5 and SHA1 are also genuine, generated by the same iso.
Zorin 16 Core iso: