The most likely reason the download was blocked, resulting in a false positive, is a misconfiguration in the endpoint protection software. False positives occur when legitimate actions are incorrectly identified as threats due to incorrect settings or overly aggressive rules in the security software. * Misconfiguration in the endpoint protection software: Common cause of false positives, where legitimate activities are flagged incorrectly due to improper settings. * Zero-day vulnerability: Refers to previously unknown vulnerabilities, which are less likely to be associated with a false positive. * Supply chain attack: Involves compromising the software supply chain, which is a broader and more severe issue than a simple download being blocked. * Incorrect file permissions: Would prevent access to files but not typically cause an alert in endpoint protection software.