Pending this website being fixed properly, you can access the Fly Patterns Library by copying and pasting this link into your browser
https://www.dropbox.com/scl/fo/d2apur5vgvetlwvoxqs75/AD7kL26Mcyjzf3UbGnVzuiA?rlkey=yc5svjvjfzxa7c75dsa8cjb0b&st=jyl2nnuz&dl=0