A high-quality, legible (but not modern) scan can be had at the National Library of Israel.
Here is the general listing for the sefer.
Here is Volume 1 of the scan and here is Volume 2.
There are also ...
Artscroll not so long ago brought out a very comprehensive biography by Yisroel Besser.
The blurb there reads:
One hundred and eighty years after his passing, he stands tall, a leader for eternity.