I have a foreign address and used turbotax free edition to file TY 2017 return but I'm now getting a messg saying I can't file TY 2018 cause IRS requires a 1040 Why now?

You must upgrade to the Deluxe version to enter a foreign address to your return. 

 However, there are some restrictions regarding foreign-address returns:

• IRS regulations require a U.S. bank account to receive your tax refund, and you'll need a U.S. bank account (or credit/debit card with a U.S. billing address) if paying additional federal taxes owed.
• Like many stateside merchants, we require a U.S. billing address to pay for TurboTax if using a credit or debit card.
• If you're deducting fees from your refund with the optional Pay With My Refund service, you'll need a U.S. or APO/FPO/DPO address.
• Free products like TurboTax Free Edition and TurboTax Easy Extension require a U.S. or APO/FPO/DPO address upon registration.

Some states also let you e-file with non-U.S. addresses. We'll let you know if your state supports this.

"File for free!” 
"File for free!” 

What BS! 

it is because you are filing foreign income now and the free version must have a U.S. or APO/FPO/DPO address upon registration. Also Turbo Tax free is only free if you have a simple return with no schedules... Foreign income reporting requires a deluxe or higher because there are extra schedules to prepare.