If you need to download ArcGIS software, you should only use official channels to ensure the installer is secure and genuine: ArcGIS Enterprise Life Cycle - Esri Support
: ArcGIS Enterprise is not free ; it requires a valid license file and authorization numbers obtained through an active maintenance agreement or subscription. Free download links from unofficial sources are often pirated versions that may contain malware or security vulnerabilities. Legitimate Ways to Access the Software ESRI ArcGIS Server Enterprise 10.5 Free Download
: ArcGIS 10.5 was originally released in December 2016. Most versions from this era are now in the "Mature" or "Retired" support phases, meaning they no longer receive routine security patches or technical support. If you need to download ArcGIS software, you
: At version 10.5, the product formerly known as "ArcGIS for Server" was renamed to ArcGIS Enterprise . Most versions from this era are now in
Below is a report on how to legitimately access, license, and download ArcGIS Enterprise software. Software Status and Licensing