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FF 24 not compatible with 22, but 22 was uninstalled; no option for full install, only upgrade

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After downloading and installing v 24, I get an error saying it is not compatible with v 22 which had been uninstalled. There is only an "upgrade" option on the initial screen.

After downloading and installing v 24, I get an error saying it is not compatible with v 22 which had been uninstalled. There is only an "upgrade" option on the initial screen.

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I can't recall hearing about this error before.

To get a "full" installer for Firefox 24, you can use this page (choose your language and click in the Windows column): https://www.mozilla.org/en-US/firefox/all/

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Do you mean this error?


Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.

Download a fresh Firefox copy and save the file to the desktop.

Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.

  • Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you lose personal data like bookmarks and passwords from profiles of other Firefox versions.

Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.

  • (32 bit Windows) "C:\Program Files\Mozilla Firefox\"
  • (64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"

Your bookmarks and other personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.