Buy once and you'll get an unlimited licence to use the ad platform on all sites that you own.
Pro membership is just $47
Have a question or feedback? Ask it on the support forum.
Looking for installation help? Browse our online tutorials.
PS. If you experience any problems unzipping the download, please try the 7-zip.org utility.
If you want to upgrade OIO manually by uploading the latest files yourself, be sure to check out the upgrade tutorial first, to make sure everything goes smoothly.