@version is just used to inform that this (i.e. method) is added in the mentioned version of the script but, THERE CAN BE SOME OTHER CHANGE(S) WITHIN AN AFFECTED FILE.

If you have added multiple languages translations, then you will have to add the newly added translations (if any when the script is updated) for all the languages that you have added, not just for English.

If you are installed the outdated version, you will have to update step by step according to your version, and PLEASE DON'T FORGET TO TAKE THE BACKUP OF YOUR EXISTING APPLICATION INCLUDING DATABASE.

Run the database queries in order. Also, check the changes after updating all the affected files otherwise you might face errors. If you're on the live server, then it's highly recommended to enable the maintenance mode (while doing the updation) by goto Admin Panel › Others › Settings › General › Maintenance.