ow_pluginfilesow_userfiles,ow_static,ow_smarty/template_c
should be 777 recursively.
Do you have correct URL in the HOME URI in ow_includes/config.php file?
Try to enable dev mode and refresh the website. By the way, do you use Lamp of Xamp?
I finally got a graphic display for the site on my localhost. When attempting to login with the user name and password I set during installatiion I was greeted with a red bar which simply said "Error" and nothing else. Any attempt to "Join" greeted me with a page not found error.
My localhost installation was simply Apache and MySQL. I did not install a group package such as LAMP or XAMP.
As to the "Error" message you can take a look at this tutorial of troubleshooting: https://docs.oxwall.org/faq:parse-error-troubleshooting
Most obviously your server does not meet our requirements in some way, unfortunately I can't provide much of assistance here as it is a local installation.
If yes, then you need to install the software in the first place via FTP, otherwise you will have to copy the files manually.