So digging through everything the code that gets generated by WkHtmlToPdf for Windows is no good - the problem for Windows, this command is not valid. If I update the config and pass directly in a binPath it works hunky dory. I think in the PdfServiceProvider you should require a binPath vs. bin and it should work correctly cross platform.
Also note, doing this way I don't have to download binaries.
- Windows CMD *
"C:\Program Files (x86)\wkhtmltopdf\wkhtmltopdf.exe" --bin "C:\xampp\htdocs\console/vendor/h4cc/wkhtmltopdf-amd64/bin/wkhtmltopdf-amd64" C:\Users\Administrator2\AppData\Local\Temp\tmpAA79.tmp.html C:\Users\Administrator2\AppData\Local\Temp\tmpAA7A.tmp