TurboTax does not support the Form 8689, however you can enter the credit that you compute on the Form 8689 (line 40) in TurboTax Deluxe. You won't have to upgrade.
Enter in the Other Credits section under Deductions and Credits. Type 'virgin islands, credit for income tax paid' in the Find box of your return. Then
select the ‘jump to’ link.
See links below for reference.
https://ttlc.intuit.com/questions/3387950-form-8689-for-usvi-income-i-understand-turbotax-doesn-t-su...
https://www.irs.gov/pub/irs-pdf/f8689.pdf