Thank you! However, Fanatical has not updated their daily free comic drops since the promotion began; the same drop of comics has been offered continuously. Today, they also removed the daily drop timer, suggesting no new releases are planned. The current free comics include:

Teenage Mutant Ninja Turtles Vol. 1: Change is Constant
Key for IDW Digital Comics Experience Android or iOS app. No PC or Mac
https://www.fanatical.com/en/comic/teenage-mutant-ninja-turtles-vol-1-change-is-constant

Medibang Manga Comic Triple Pack (Chrysanthemum Boy, The Key In The Cage, A Long Stay)
Download - Zip - 52.5MB
https://www.fanatical.com/en/comic/medibang-manga-comic-triple-pack

Czarface: A Czar Is Born
Download - PDF - 89.7MB
https://www.fanatical.com/en/comic/czarface-a-czar-is-born

A Very Valiantine's Day Special
Download - PDF - 203.1MB
https://www.fanatical.com/en/comic/a-very-valiantines-day-special

Preview files available for all. Promo through to Friday, May 9th.

They didn't make it obvious, but if you scroll right you'll see they added four digital issues from this year's FCBD.