Reply To: Theme update

It looks like five people trying to help and answer and I need to explain to each one individually.
New theme is installed but i asking you is it possible to update old one which have older version so that i reactivate that one. On new one i do not have slider to edit which is in older version. I am not sure did i got all info transferred into new one, and what to do next time when i get new update, again install third one?
If you can help to solve problem to update old theme with old version and how to do that proper way because there is no update button like some other seller have.
I checked your tutorial do not need to send me link.
Thank you