Since a full English translation of the Sefer HaTemunah is rare, your best bet is not the raw PDF, but academic secondary sources:
Search query result: The direct PDF from HebrewBooks.org is the highest quality, most complete, and free version available for "Sefer HaTemunah PDF best." sefer hatemunah pdf best
Interpretation, Rewriting, and Editing: The Copyists of Sefer ha-Temunah in Ashkenaz Since a full English translation of the Sefer
Unlike narrative Kabbalistic texts, Sefer HaTemunah is primarily concerned with —the study of the form of letters. The central premise is that the Hebrew letters are not merely tools for language but are the atomic building blocks of reality. sefer hatemunah pdf best