In Case 2 after downloading the plugin I replace the old version with the new by using an FTP?
In order to activate the plugin is it necessary to add the code you provide in the file functions.php?
Last but not least as I wrote in previous message sometimes there is an issue with the alignment of the homepage. Please see attachment https://ibb.co/5K5JnyH
Currently I see 2 sections are still showing the same. For the simplest, you should copy this section and paste it into the page you want to display, then edit the image and text again: https://prnt.sc/ftt0qMjVq52F