The system requirements for Autodesk AutoCAD 2010 are:

: While AutoCAD (plain) and Civil 3D require a Windows or Mac OS, you can use the AutoCAD Mobile app on tablets for viewing and light editing.

Warning first: using or downloading “portable” versions of commercial software like AutoCAD typically violates Autodesk’s license and often exposes you to malware, missing updates, and poor performance. Prefer licensed, official releases.

The search term is popular for a reason. A "Portable" version of software implies that it is a standalone executable that does not require a traditional installation.