H&R is using the Draft 2017 form and information. While you "can" use this, it's not a very good idea, to the point where the IRS specifically marks that form as "DO NOT USE". The use of it will not prevent electronic filing, however A: If the final form differs, they may send a nastygram demanding that you amend your return, and B: The willful use of things labeled "DO NOT USE" is a highly-weighted audit trigger. While it doesn't guarantee an audit (Just like being perfect doesn't guarantee a lack of one), it increases the chances of one substantially.
Folks should wait for the IRS to make the final version of the form available before filing, unless they love audits.
