. Starting with the 2020 release, Autodesk transitioned AutoCAD to a 64-bit-only architecture

AutoCAD 2020 was designed to take advantage of modern 64-bit processing for better memory handling and performance. If you attempt to install the standard 2020 version on a 32-bit version of Windows, the installer will fail. 2. Best Alternatives for 32-Bit Systems

By sticking to 32-bit (and using AutoCAD 2018), you miss out on specific AutoCAD 2020 features:

The most important thing to know about AutoCAD 2020 is that it does not officially support 32-bit operating systems

Starting with on a 32-bit architecture is tricky because Autodesk officially discontinued support for 32-bit systems starting with the 2020 release. All AutoCAD 2020 versions are natively designed for 64-bit operating systems .