Hello.

You need to do the following:
1. Go to Studio -> Settings -> Site Settings and enable 'Force auto-update, even if some files were modified' setting.

2. Edit inc/classes/BxDolInstallerUtils.php file, find the following line

define('BX_FORCE_AUTOUPDATE_MAX_CHANGED_FILES_PERCENT', 0.05);

and replace 0.05 with 0.99

3. Apply update from Studio -> Dashboard -> Version section.

NOTE!!! All your customizations will be overwritten in this case and most of them are corrupted. You may use this way if you are sure that all your changes aren't needed and can be restored.