Upgrade to 1.5.2 - 404 error

[alvagram]

Hi,

 

I am trying to do a manual upgrade from 1.4.7 to 1.5.2 following the steps described at http://doc.prestashop.com/display/PS15/Manual+update+%28experts+only%29

 

At step 3, when I try to run the upgrade.php script I get a blank screen from 404.php

 

I have repeated the uploading of 1.5.2 files just in case there was some error during initial uploading, however got the same result again.

 

Any suggestions ? Could this have to do with file permissions ?

[alvagram]

P.S. Just saw that the Documentation Team changed the update documentation today. I did everything based on previous documentation version (v.12) which did not involve doing first the update on a local server.

 

Anyway, the problem occurs when I try to access http://www.maralepostcards.com/store/install/upgrade/upgrade.php.