This version of Malleus is handy more for students of literature than for students of history or those wishing to seriously study the history of the paranormal. This particular version - the Montague Summers translation - is inaccurate as an historical source and those who seek to use it as such are backing a loser. Summers mistranslated much of the original latin either by accident or design; he uses a single word - "witch" - for a multitude of nouns which vary in gender application; they are either male, female or simply ambiguous and common to both. Summers also had his own social agenda, really believing that a powerful cult of devil worshipping sorceresses stalked the middle ages and deserved to be wiped out.
Yes, the original text is at times misogynistic in tone. So what. So was medieval and early modern European society in general. So are many societies worldwide today. It is NOT however the venomously misogynistic tome which this translation would have the reader believe. For those who wish to study how different versions of the same book can emerge over time, for those who study literature in general, then the book is an interesting curiosity. This version's historical importance, however, is over-stated and undeserved, for it is really only of use as a tool to examine attitudes to witchcraft in the 20th and 21st centuries, not as a yardstick for those attitudes at the time when the original was written.
The serious student of the subject is advised to consult the newer translation by P.G Maxwell-Stuart, an expert in the field with no agenda to pursue rather than the provision of an accurate version of the text. Montague Summers was an eccentric and enthusiastic, not to mention partisan and deeply flawed, layman. The serious student is advised to track down a copy of Martin Del Rio's "Investigations Into Magic" - also translated by Maxwell-Stuart - as well. Trust me it will be worth it, and Malleus makes more sense when considered as just one of a series of related texts rather than an isolated case. While you're at it, try Menghi's "The Devil's Scourge" as well.
FYI - Heinrich Kramer and Heinricus Institoris - two individuals listed among the authors - were actually the same person. In addition, Kramer was the main author, not Sprenger, the involvement of whom was fleeting at best, and is now itself in doubt.