1- please update the Permalinks:
-go to Settings >> Permalinks and chose Post name and click Save Changes (even if you already have it set on post name, please update by saving)
2- Rev slider is not imported with the demo content, you’ll need to import the sliders, you can find them in your download folder [Sliders import].
Download the slider’s mock-up from here
Home Page Slider : https://support.creiden.comwp-content/uploads/2014/07/CF.zip
If you still have any errors, please reply with WP Admin access and FTP access in a private message here.