Ah, it doesn't look like this poster has shared anything else on the PL site, but you can try contacting them directly (if you leave a comment on the research note and @ their name, they should get an alert).
What are you hoping to count? I see that there are some other open source cell-counting projects out there-- would something like this be useful? http://opencfu.sourceforge.net/
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I'm looking to count cells from a homogenized tumor. I'm new to this DIY/open-source approach. I think the concept is amazing!