I already had this one sometime ago. One has to download each letter-volume. But this is quite reader-friendly.Perhaps, the frequent updating of adobe often renders the many other online editions  difficult to use or time consuming. I gave up the some others after some attempts.
Many help seekers must have been silent ones like me and also thankful for the information received.. Once I contemplated buying Malalasekhara's work. Now I find that unnecessary.
Best
DB

From: Dan Lusthaus <vasubandhu@EARTHLINK.NET>
To: INDOLOGY@liverpool.ac.uk
Sent: Sunday, 1 April 2012 12:07 AM
Subject: Re: [INDOLOGY] Dict. of Pali Proper Names

There are also at least two online versions of the Dictionary of Pali Proper Names, very easy to use.

http://www.palikanon.com/english/pali_names/dic_idx.html

and

http://www.aimwell.org/DPPN/index.html

From time to time it is worth consulting the printed edition (or a PDF of
it), but all the information is available for lookup at the above urls.

Dan Lusthaus