@JANDOE ,
Yes do backups, that is important.
When you redo it, write down each step,as to do it. Then if you get to the end and it is not right you can check back or show it to me. It is a good habit to get into when changing system things.
I forgot to say that the downloaded file will be in the Downloads directory, and you need to copy it to the work directory before doing the
‘dpkg -i’ command. I think you would have known that.
I do not understand why you say you are looking for ‘install’ under ‘extensions’. You dont install from there. The ‘dpkg -i’ command does the install. It is not like adding an extension to the firefox browser where you do ir in the browser. You do not do the install from inkscape. You do it with ‘dpkg -i’.
What you should see under ‘extensions’ is just the inkstitch item.
Regards
Neville