I actually got it to work after I brought this issue up, but it required searching around and I think swapping out the offending files with newer versions. Still, it was a pain and the dev should just do it themselves.
I am getting the error "Harfbuzz version too old (1.3.1)" when I try to run the executable. Apparently, the only way to remedy this is to recompile the project with a newer version of Harfbuzz. Could you do that for me?