try, the first method is:

1. Press the Windows Logo key + “R”
2. Type %programdata% and press Enter
3. Delete the following folders:
4. • PCDr
   • PC-Doctor, Inc
   • SupportAssist
5. Press the Windows Logo key + “R”
6. Type %appdata% and press Enter
7. Delete the “PCDr” Folder
8. Go to the folder “C:\Program Files\Dell\”
9. Delete the following folders:
10. • SupportAssistAgent
    • SupportAssist
11. Press the Windows Logo key + “R”
12. Type regedit and press Enter
13. In the Registry Editor Delete the following registry keys:
14. • HKEY_LOCAL_MACHINE\SOFTWARE\PC-Doctor
    • HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\PC-Doctor
    • HKEY_LOCAL_MACHINE\SOFTWARE\Dell\SupportAssistAgent
    • HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Dell\SAA

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Assemblies\C

Program Files|Dell|SupportAssistAgent|bin|SupportAssistAgent.exe"

12.Download SupportAssistx64-2.2.0.253.msi from:

https://downloads.dell.com/serviceability/Catalog/

13.Uninstall Support Assist

14.Install Support Assist from the Support Site

The download link doesn't work for me

But do I need to delete all the registries in the Assemblies folder or just some and what are the registries in the Assemblies folder for?

Instead, can you just send me a direct download link instead of the link you've already posted since it doesn't work there's no MSI download there?

Link https://downloads.dell.com/serviceability/Catalog/ not working too for me

Give a blank page contain text  : "Not a file"