WkhtmlPDF issues with the path in CiviCRM
You need to give it the FULL path, and include the actual executable file, e.g.

/usr/local/bin/wkhtmltopdf

The path you have in the screenshot has 3 problems:


it's missing the wkhtmltopdf executable at the end
it's not absolute, i.e. starting from the very top level / directory
it would be really unusual to have usr/local/bin under public_html. Your installed executables shouldn't be under public_html (security risk) and I doubt an rpm would put them there unless you manually put them there. When you say "unpacked" do you mean installed (rpm -ivh) or just extracted the files inside and put them under public_html?