As part of our ongoing efforts to improve the performance of AdWords scripts, we are making some changes to the way we provide execution logs for scripts.
Starting May 15, 2014, we will only retain detailed
execution logs for scripts that ran during the last 90 days. If you need to retrieve changes made by scripts from an earlier date, you can refer to your account’s change history.
If you have any questions about this change, let us know on the
forum or on our
Google Ads Developers Google+ page.
Anash P. Oommen, AdWords Scripts Team