Help with applying your service code has been provided below. If this doesn't help please let us know so we can better assist you.
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The download version can only be installed on a Mac computer running OSX 10.14 or higher. It cannot be installed on a iPad.
The license code is only for the download and not the online version that does not have a license code and the pricing is very different. If you purchased from TurboTax you can get a refund by contacting customer support.
There is no single published number because it changes contently depending on the nature of the call and agent availability. Following the link below will either give a current number for you to call or take your number for a callback.
(Note that phone support is for paying customers only. There is no phone support for Free Customers.)
Here is a TurboTax FAQ for contacting customer support.