If you just need to view or edit .DWG files from a USB stick, use these:
By now, every bug in the 2007 version is well-documented. It is famously stable, rarely crashes, and handles .DWG files with precision. Top Features of the 2007 Version FULL AutoCAD 2007 Portable
Practical tip: If long-term access to legacy DWGs is required, convert a canonical copy to a stable, documented format and keep the original as archived backup. If you just need to view or edit