A minor fixed is done. Category slug and the site icon preview is fixed now.
Your server PHP version. Try changing the version of PHP.
Thanks a lot for your interest on LinkDir script. All files are required. Just make sure those are in the root directory. The folders are already arranged and nothing to do extra. A quick setup video is here New version (v-2.x) is has included easy installation wizard. So you just have to upload the mail files in the root folder. LinkDir contains documentation and main folder. You will need to upload main folder and move all the files to the root directory. In most cases it is called public_html....
Installation is easy you just have to follow the steps. LinkDir script has easy installation wizard which makes it very simple to start your own web directory within minutes. Step 1: Upload script and upzip Step 2: Open the URL (yoursitename.com/install) - You will be instructed to fill the database info and other setup. And the hit the final button to complete the installation process. Admin credential: Username: admin@site.com Password: 12345678