A scan of an English translation of Sādhanamāla is presently available on the Internet Archive:
If you already own a printed edition of Sādhanamāla (English translation) and want a digital backup for personal use:
: Edited by Benoytosh Bhattacharyya (1925). This volume includes 170 sādhanas and can be downloaded or read on Internet Archive and Scribd Sadhanamala Volume II
