Thank you for the reply Kobra,

I am using zen-cart 1.37

I have installed the following mods:
AusPost 3.02 - with SQL patch
Backup Mysql Plugin 1.2.10
Checkout Payment Module 1.3 - with SQL patch
Direct Bank Deposit 0.1
Optional Shipping Insurance 2b
Time Zone Offset 1.37 - with SQL patch

I did apply the Stock by Attributes SQL patch first, before uploading the files.

I just checked then, and none of the files that were uploaded with this mod were 0 bytes.

Do you think it has something to do with the mods that I have already installed ?

Thanks,
anthony