Frauwallner's "Geschichte der indischen Philosophie" has been reprinted in 2003 by Shaker Verlag in Germany (http://www.shaker.de/de/content/catalogue/index.asp?ID=7&AID=826&SHV=yes). It is also available as an online-publication for sale from the publisher's website (and comes as a PDF).
In the interest of supporting specialized academic publishers, I would encourage purchasing the publication from them.