Starting from a new Pharo 11 image, and then the visualization tool itself:
Metacello new
baseline: 'DebuggingSessionAnalysis';
repository: 'github://bergel/DebuggingSessionAnalysis:main';
load.
You then need a trace to be visualized. Unfortunately, no traces are publicly shared at this moment. Once you have a trace, you can open the visualization using the following incantation:
DSA new
fromFileName: '/Users/alexandrebergel/Downloads/internal-tests/User-V.ston'.