Typically caused by a problem with your .htaccess file, there is a simple fix: Log into your wp-admin, navigate to Settings: Permalinks in the WordPress menu and click the "Save" button to update permalink settings to your .htaccess file. This typically resolves this problem.

This is usually caused by entering the source site URL as the destination URL on Step 3. Re-restoring using the correct URL should fix this problem.

This is caused if you restored over your source site database by entering the source site database settings on Step 3. This means that your new site AND your old site are now using the same database but the database has been migrated to work with the new URL. You may re-restore both the source and destination using correct settings or use the mass database replacement tool. You may correct the modified URL on the source site by using the Server Tools page's Mass Text Replace tool within the Database tab.