Autocad 2007 Pl - Portable _top_ Info
– Reads and writes native .dwg format up to version 2007. It can open newer files (up to ~2018 with a free converter tool) but cannot save newer features. For 90% of 2D construction plans, this is enough.
If you cannot find a clean portable version, consider these modern, legal, and lightweight alternatives (all free for Polish users): Autocad 2007 PL - Portable
Would you like help converting old 2007 DWG files to a modern format instead? – Reads and writes native