Hi Danielle,
I am sorry for this issue but do not worry and it will be taken care of very quickly by following these simple steps.
Please download and install Creative Cloud Desktop apps from https://creative.adobe.com and once done try downloading Indesign again. it should work.
If you have Indesign CC apps then you can download it from CC desktop apps otherwise you need to select CS6 from the https://creative.adobe.com to download.
Hope it helps.
Regards,
Abhijit