64-bit systems can access much more RAM, which is essential for rendering and large-scale drafting.

By focusing on 64-bit solutions, Autodesk can deliver more advanced features that simply wouldn't run on older 32-bit technology. Official System Requirements for AutoCAD 2020

Since there is no 32-bit version, your computer must meet the following requirements to run AutoCAD 2020 officially: Minimum Requirement Operating System 64-bit Microsoft Windows 7 SP1, 8.1, or 10 Processor 2.5–2.9 GHz (3+ GHz recommended) Memory (RAM) 8 GB (16 GB recommended) Disk Space 6.0 GB for installation Display Card 1 GB GPU with 29 GB/s Bandwidth (DirectX 11 compliant) Alternatives for 32-Bit Users

If you must remain on a 32-bit system, you cannot use AutoCAD 2020. However, you have several alternative paths: 1. Use AutoCAD 2019 or Earlier AutoCAD and AutoCAD LT 32-Bit Discontinuation - Autodesk