Installer VSIX error (REGDB_E_CLASSNOTREG)

I was trying to update "Github Extension for Visual Studio"

I opened "Extension and Updates", clicked to update the extension — it is downloaded and VS showed message:

Your changes will be sheduled. The modification will begin when all Visual Studio windows are closed.

Then I closed VS and error happened.

Installer VSIX
Retrieving the COM class factory for component with CLSID
{177F0C4A-1CD3-4DE7-A32C-71DBBB9FA36D} failed due to the following
error: 80040154. Class not registered (exception from
hresult: 0x80040154 (REGDB_E_CLASSNOTREG))

The extension was not updated.

The same thing happens when I try to install a new VS Extension. I was trying to start VS as Administrator.

Windows 10, VS2017

I reinstalled Visual Studio before this question, so didn't try Repair option, but Visual Studio Installer → Repair helps.