From Readme:
HOW TO UPDATE:
Download the latest version of Aslain's mod pack (linked here), and run the installation again.
The Clean Installation is not required, unless you encounter problems.
I would also advice to select backup session stat data (unless it was updated too), and modsettings tab.
Nothing more is required, and yes I know it's probably not the most convinient way to update, but there is no alternative at this moment.