In Windows 10, after installing Acrobat Reader 2020 the start menu shortcut for the previous installation of Reader (2017) has not been removed. The Reader 2020 installer is expected to remove the Reader 2017 start menu shortcut. This does occur as expected if the base version of Reader 2017 (17.008.30051) is installed prior to installing Reader 2020.

Steps to reproduce the issue:
1. Install Windows 10 Enterprise.
2. Install Adobe Reader 2017 (Classic Track) using bootstrapper installation (setup.exe). Setup.ini includes PATCH command under [Product] section; PATCH=AcroRdr2017Upd1701130196_MUI.msp.
3. Install Adobe Reader 2020 (Classic Track) using bootstrapper installation (setup.exe).

Bootstrapper Deployment
https://www.adobe.com/devnet-docs/acrobatetk/tools/DesktopDeployment/bootstrapper.html