If after setup Spell Checker does not appear in the Tools menu, try the following

  1. Try installing add-in as administrator. Setup needs to register COM components so it needs access to Local Machine registry key. You may want to save MSI file to disk first and then run it.
  2. Try registering component manually by running regsvr32 vsspellchecker.dll from the command line in the installation folder.
  3. Verify that Add-in appears in the registry. Here are screenshots of the VS 2005 add-in registration: