ArcGIS Desktop 10.6 is not available for free as it is a proprietary professional software. While you may find unofficial links from third-party sites, these often carry security risks like malware and are not authorized by Esri.
There are a few options available for downloading ArcGIS 10.6 for free: download arcgis 106 free
Step-by-Step Guide to Downloading ArcGIS 10.6 for Free ArcGIS Desktop 10
If you meant "106" as a number (not version 10.6): There is no ArcGIS 106. ArcGIS versions are like 10.x, 10.8, ArcGIS Pro 2.x/3.x. ArcGIS versions are like 10
ArcGIS 10.6 (specifically Desktop/ArcMap) is a legacy proprietary software developed by Esri. It is important to note that as of March 1, 2026 , ArcGIS Desktop has officially retired. Free Download Options no permanent free version
Important: ArcGIS Desktop (including ArcGIS 10.6) is a commercial product from Esri. There is no legitimate way to obtain a full, permanent, paid license for ArcGIS Desktop for free. Below are legal options for obtaining and using ArcGIS 10.6 or equivalent functionality without violating terms.
License and deployment | ArcGIS Maps SDK for .NET - Esri Developer