To download data from multiple campaigns in your account:
If you would like data for only one campaign, click on the campaign name, then click the Download Campaign button in the upper right.
If you would like data for only a select group of campaigns (e.g., those with a cost over $200), use the search function to filter the campaign list and then select Download Campaigns.
You can also select similar options when downloading ad groups and keywords.
Clicking on the Download Ad Groups button from the account-level Ad Groups page provides the following preference selections:
Clicking on the Download Keywords button from the account-level Keywords page provides the following preference selections: