Hi Nalica,

CAPTCHA challenge is thrown by the ClientLogin API (
http://code.google.com/apis/accounts/docs/AuthForInstalledApps.html) if you 
request a large number of authTokens in a short period of time. It has 
nothing to do with AdWords API as such, so if you reuse your authTokens, 
you won't get Captcha challenges if you download several reports in a short 
period of time. I recommend this: Get an authToken as the first call in 
your script, then use that token to download all the reports. You won't get 
any CAPTCHA challenges at all this way.

Cheers,
Anash P. Oommen,
AdWords API Advisor.

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