Missing Files After PrestaShop Upgrade 1.5.6.2 from v.1.4.4.1
BO Advanced Parameters > Configuration Information
List of changed files
Changed/missing files have been detected.
Missing files (18)
admin/autoupgrade/index.php
override/classes/cache/index.php
override/classes/controller/index.php
override/classes/db/index.php
override/classes/exception/index.php
override/classes/helper/index.php
override/classes/log/index.php
override/classes/module/index.php
override/classes/order/index.php
override/classes/pdf/index.php
override/classes/range/index.php
override/classes/shop/index.php
override/classes/stock/index.php
override/classes/tax/index.php
override/classes/webservice/index.php
override/controllers/admin/index.php
override/controllers/admin/templates/index.php
override/controllers/front/index.php
Steps to correct missing files from being detected..
Step 1.) Include a downloadable index.php file provided from PrestaShop (PS) that was not included in upgrade, and place in each of the directories of missing files.
Results..
Success, no missing files where detected!
However, FYI.. I did this with default theme installed and not 3rd party. According to PS community forum the above solution 3rd party theme resulting in problems.
Resources
Upgradeing to PrestaShop 1.5.6 missing files: http://www.prestashop.com/forums/topic/288652-upgrading-to-prestashop-156-missing-files/