You can use Help to Buy with a Generation Home mortgage, but please note that there are a few restrictions when it comes to adding an Income Booster.
Income Booster would be ineligible as when purchasing with Help to Buy you must not own any other residential property, or have your name attached to the deeds of another residential property, in the UK or abroad. The home purchase through an equity loan must be the only home you will own.
Because the Income Booster is not on the title deeds it leaves space to break the rules of the Help to Buy eligibility criteria.
You can read more about Help to Buy eligibility here.