Once you let me know which software it's for, I can provide more specific details or troubleshooting tips!
However, "Tesselator" can refer to a few different things in the creative world. To make sure I'm helping you find exactly what you need, could you clarify which one you are looking for?
: An addon designed for creating complex tileable patterns or remeshing.
It looks like you're searching for a download link for from the site vfxmed .