Ihave a chromebook. I understand that I need to use the download product. When I went to download, the only choices were "Windows" and "Mac". What do I do?

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Actually, TurboTax Online supports the Chromebook as long as your computer system meets the recommended minimum hardware requirements. Please see the FAQ below (click see entire answer):

https://ttlc.intuit.com/replies/3300638

Please reply below if you have any additional questions.

So which option do i choose?

Neither - there is no CD/download product that will run on a Chromebook.    You can use the online (web based) versions with a compatible browser.    The answer above applies to the online version.

im trying the online version and it still tells me to download either the mac or windows version

and i have chrome downloaded which should be compatible.

There is no chrome download - only Mac or Windows.

<a rel="nofollow" target="_blank" href="https://turbotax.intuit.com/personal-taxes/cd-download/basic.jsp#requirements">https://turbotax.intuit.com/personal-taxes/cd-download/basic.jsp#requirements</a>

To use downloaded version,on a chromebook, like to file to previous years,  you need to use a windows emulator.

There are someavailable on play store.