Ok so here’s how to manually fix your registery key (works with other apps that have installation problems, like my Mumble that was trying to install an older version than the installer I opened):
- Access the RegEdit by openning the windows menu and typing “regedit.exe”.
- Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products
- Go down the list of keys and delete any that has a subkey “Product name” about Warcraftlogs or Adobe Air.