Steps to upgrade Seo Panel plugin
1) Replace plugin folder with new version of plugin folder
eg: seopanel/plugins/linkdiagnosis
with new version of linkdiagnosis folder
2) Go to Admin Panel => Seo Plugins Manager => Select "Upgrade" from right most Action select box.
3) Confirm upgrade process.
4) Check the version of plugin, you can see it is changed.
Get Seo Panel Plugins from =>