Following things you need to check and make it work on paid osCommerce module:

Create backups not backup folder under /httpdocs/admin/backups

Create cache folder under /httpdocs/ and /httpdocs/admin/

Enable register_globals > ON

Select open_basedir from whatever change to {DOCROOT}\ from the drop down menu.

Select session.save_path from whatever change to {DOCROOT}\tmp and no need to create tmp folder on /httpdocs/

Select PHP Support version 5.2.x above

Select PHP run as FASTCGI application

Enable CGI support

Enable Perl Support.

Enable cache optino :

http://domainname.com/admin/

Click Cache under Configuration :

Change :
Use Cache    false
to
Use Cache    true

Change :
Cache Directory > /tmp/
to
Use Cache    cache

To enable backup option, so follow this step:

The remedy is to make sure backup.php thinks the file is not there. This is a bit hidden IMO, in admin/includes/application_top.php around line 40:

// Used in the "Backup Manager" to compress backups
  define('LOCAL_EXE_GZIP', '/usr/bin/gzip');
  define('LOCAL_EXE_GUNZIP', '/usr/bin/gunzip');
  define('LOCAL_EXE_ZIP', '/usr/local/bin/zip');
  define('LOCAL_EXE_UNZIP', '/usr/local/bin/unzip');

If you change it (I think this should work) you won't have the problem anymore:

// Used in the "Backup Manager" to compress backups
  define('LOCAL_EXE_GZIP', 'gzip'); // originally: '/usr/bin/gzip');
  define('LOCAL_EXE_GUNZIP', 'gunzip'); // originally '/usr/bin/gunzip');
  define('LOCAL_EXE_ZIP', 'zip'); // originally: '/usr/local/bin/zip');
  define('LOCAL_EXE_UNZIP', 'unzip'); // originally: '/usr/local/bin/unzip');