Starting with Smarty 2.6.23 Composer has been configured to load the packages from github.
NOTE: Because of this change you must clear your local composer cache with the "composer clearcache" command
To get the latest v2.6 release use
"require": {
"yasinovsky/smarty": "~2.6"
}
in your composer.json file.
The "yasinovsky/smarty" package will start at libs/.... subfolder.