OSC and WP Repair

1. Need OSCommerce proficient to repair and upgrade site, and repair WP files. The site looks and works as I want, but links are broken and I cannot now access OSC admin panel. I want to clean up non-standard code areas that block updates, or install new copy and bring over existing catalog. Catalog product pages must be viewable when not registered but without showing price or buy option. After registration and log in, price and buy buttons active. I do not need affiliate capability. Install/copy Paypal plugin. Note retain left column use. ([login to view URL]) Error message when logging in to OSC admin: "Warning: require(/home3/drdave/public_html/store/includes/classes/[login to view URL]): failed to open stream: No such file or directory in /home4/drdave/public_html/store/admin/includes/classes/[login to view URL] on line 13 Fatal error: require(): Failed opening required '/home3/drdave/public_html/store/includes/classes/[login to view URL]' (include_path='.:/opt/php56/lib/php') in /home4/drdave/public_html/store/admin/includes/classes/[login to view URL] on line 13" 1. Wordpress has 2 issues that need correcting, may be related to update to 5.0. Site is functioning and have access to admin panel but left column links no longer function, return 404. Pages are intact, I suspect this is a permalink issue. Second, unable to update Enfold theme, and its page editor. ([login to view URL]) 3. Do basic SEO to correct H1, meta and other issues that have crept in, correct Google Analytics and Ryte identified issues. Basic SEO, just to fix problems identified in G Analytics and Ryte, This is a low volume site and don't need the marketing aspect of SEO beyond basics. I need to strip out extra code that has been done and is interfering with updats, no longer need the special functions.