The Spectrum Computing forums maintain a "Tools" section with community-vetted downloads. Their ZXCopy 3 entry includes a SHA-256 checksum. Compare your downloaded file against their hash.
Some official sites offer downloads via verified mirrors like GitHub Releases or Amazon S3. These are still safe. Look for a GitHub releases page under an organization named zxcopy-official. A verified GitHub release will have: zxcopy 3 software download verified
Rarely, aggressive heuristics may flag a legitimate ZXCopy 3 component (especially the driver-level disk access module). If you have verified the digital signature and checksum, add an exception in your AV. Then report the false positive to your AV vendor and to the ZXCopy support team. The Spectrum Computing forums maintain a "Tools" section
If you are certain the software is named "Z-Copy": zxcopy 3 software download verified