If you’re using AdWords 3.5 editor, the AdWords team has made a reqest to all AdWords Editor 3.5 to upgrade to the latest AdWords 4.0 before October 3, 2007. As after October 3rd, 2007, version 3.5 will no longer be supported.
Google, AdWords, AdWords Editor, Tools, Announcement
As you may already know, old versions of AdWords Editor are retired 60 days after new versions are released in order to optimize our resources and provide the best user experience for AdWords Editor users.
To upgrade, just follow the automatic download prompt that appears when you start AdWords Editor. Important note: To preserve any comments or unposted changes, you will need to export an archive of your account before upgrading. After you've completed the upgrade, simply download your account and import the archive file.
For a complete list of version 4.0 features, please see our release notes. And, if you're not sure which version of AdWords Editor you are using, here's how to find out: Within the program, go to the 'Help' menu then click 'About AdWords Editor.'