Do you need to prepare a 1041 Estate/Trust return? Or just enter a K-1 you got?
To prepare the 1041. You need to buy Turbo Tax Business, not to be confused with the personal Home & Business version. Home & Business is just for personal returns that need schedule C for self employment. TT Business is not available to do online or on a Mac. You can buy the Windows Desktop program here,
https://turbotax.intuit.com/small-business-taxes
Window System Requirements
https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-windows-software/00/26175
How to file a 1041 Estate/Trust return
https://ttlc.intuit.com/community/my-tax-return/help/how-do-i-file-form-1041-for-an-estate-or-trust/01/26382
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