http://dwebkjkovsjobzrb45dz6prnlifnapiyp2dba33vcmcsaikr2re4d5qd.onion/knowledge/how-to-install-the-tor-browser-and-stay-anonymous
However, if you’ve downloaded the file from a trusted source, then you don’t have a problem. If you would like to check the GPG signature, however, keep in mind that the process is easy. You will need an additional software for that, but there’s a how-to section on that by the Tor Project (the developers of the browser itself) for you.