How to update Drupal 8 Core manually

1) Set the site to under maintanance

2) Make a backup for Database & Files

3) Remove all folder and file axcept:

  • Libraries
  • Modules
  • Profiles
  • Sites
  • Themes

* The above folder contain all the modules, themes, libraries, files and setting that we have done. So this folder & file must keept and no need to replace 

Note: Before remove the file, keept or rename robot & .htacess (if we have done or modified)

4) Copy all the folder from the latest drupal version (except the above folder

5) Update.php