Windows 10 (64-bit), Windows 8.1 (32 or 64-bit), or Windows 7 SP1 (32 or 64-bit). Processor: Minimum 2.5–2.9 GHz; 3+ GHz is recommended.
For more specific troubleshooting or if the version isn't appearing in your portal, the AutoCAD Community Forum is a great place to ask for help from other users who have navigated the same legacy download path. AutoCAD 2019 - Forums, Autodesk how to download autocad 2019
Uses your web browser to download the full installation package. Step 5: Install and Activate Run the downloaded Windows 10 (64-bit), Windows 8