You can try to restore any changes you made if you did any. I know you did not upgrade your site for long time so you have to upgrade from the same version that you have installed on your site, you can update the code files from the same version that you have on your server, you also can try to restore the sell page and the place bid page. We our self do not keep any older versions, we always keep only the latest version. Of course as usual we can fix it as custom work but you have to renew your license. Always try to test the site after every small changes or modification that you make. We also recommend to backup your entire site from your cPanel or your site control panel. Thanks
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