We have added support for AdWords API v201609 reports in AdWords Scripts. The major changes in this release are:

• The ClickType column is no longer compatible with fields for other types of interactions, such as AverageCpe, AverageCpv, VideoViewRate, and more. See a complete list in the v201609 migration guide.
• The ExternalConversionSource field was added to several reports to allow segmentation of conversions by source.
• The AUDIENCE_PERFORMANCE_REPORT no longer returns rows for excluded criteria.
• All fields related to AdWords Campaign Experiments have been removed, as the feature is being sunset.

See the AdWords API release notes for more details.

The v201607 will remain the default version for reports until the week of November 28, 2016. This gives you enough time to verify your scripts and make sure they work with the latest report version.

If you use API versioning in your reports, you need to modify your code to use v201609:

var report = AdWordsApp.report(query {
  apiVersion: 'v201609'
});

If you don't use API versioning, no code changes are required. Your reports will continue using v201607 for now, and switch to v201609 when we make v201609 the default version the week of November 28, 2016.

If you have any questions about these changes or AdWords scripts in general, you can post them on our developer forum.
- Mike Cloonan, AdWords API Team

Source: Google Ads Developer Blog