The biography by Walter Isaacson can be accessed or purchased through several digital platforms: Public Libraries & Archives :
Published in 2007, this is the first full biography of Albert Einstein written after his personal papers were completely opened to the public. Isaacson explores how Einstein's rebellious personality fueled his scientific imagination, leading to his revolutionary theories on relativity and his role as a global icon of genius. walter isaacson albert einstein pdf
If you have decided that you must have the PDF for legitimate research (e.g., you own the hardcover and want a digital backup), here is the cleanest path: "Einstein: His Life and Universe" The biography by