Handel: Serse/Ombra mai fu work page locked

[Jaquick]

I have the Ditson edition of "Holy art thou" (the Handel Largo arranged for choir and organ by Alfred William Phillips / "Leigh Kingsmill"), which is nicer to read from than the other edition available. But when I attempt to load it, I get "Error: This page has been protected to prevent editing.". Which I can understand, actually, given its complexities. But how should I proceed?