Use the (download from Autodesk’s website). Do not manually delete folders—leftover registry entries will block future installations.
Autodesk typically promotes the newest version (currently Revit 2025 or later) on their main homepage. To find the 2020 version, you often need to visit the Autodesk Education Community (if you are a student or educator) or the Product Download Archive . autodesk revit 2020 trial version download
If Revit 2020 is not listed in your Autodesk Account, Autodesk typically offers “previous versions” download links for subscribers. If you have an active subscription for Revit (or Autodesk AEC Collection), you can download older builds from the product’s download section. Use the (download from Autodesk’s website)