I think I might have found a way:
- In
C:\ProgramData\Package Cache\{57F20F04-014D-453F-B6A3-AE9485C4DFAB}v5.0.30709.0\packages\Blend_Core
, right-click Blend_Core.msi and click Uninstall. - In
C:\ProgramData\Package Cache\{532DBCC8-9468-435C-AEF6-30B7F50735A2}v5.0.30709.0\packages\Blend_LP
, right-click Blend_LP.msi and click Uninstall.