Ilkka V. and I put a lot of effort into attempting to make a digital readable copy of Gassendi's work on Epicurus, but the end result was probably not worth the effort.
No doubt there remain a lot of interesting issues to explore, including (1) following the threads of Gassendi's influence on others, and (2) seeing if Gasssendi referenced sources that were available too him but not to us today.
I've placed a copy of the latest transcription work here, if anyone decides at any point to explore it further. The text is a mess and needs lots of work, but it should be largely readable in parallel with the PDF when there are obvious errors.
I would recommend that anyone working on this use the transcription as a guide to the contents but ultimately link to and reference the PDF at Archive.org.