You can download the latest release of the Pro version of the SpeakOut! WordPress petition plugin.
If upgrading do not uninstall the free version.
Click here to download speakout.zip.
To install, use the built plugin installer – dashboard > plugins > add new > upload plugin

It will install the plugin if you don’t already have the free version or update the free version to the Pro version. You need a license key to activate the Pro version.
Once you have version 105.0 or later, updates will work the same as other plugins.
If you don’t have or don’t plan to buy a license key, you should install the free version from your dashboard plugin area or you can download it here.