when installing does not give UPGRADE OPTION

[irishshopper]

That will be the problem re the prefix !!

The old database had a zen_ prefix but the instructions for 1.5.1 recommend NO PREFIX so I went with that recommendation.

I take I need to add in these changes in the two configure.php files.

How do I change it in the new Database or do I need to create a brand new database now with zen_ prefix ?

[DrByte]

That will be the problem re the prefix !!

The old database had a zen_ prefix but the instructions for 1.5.1 recommend NO PREFIX so I went with that recommendation.

I take I need to add in these changes in the two configure.php files.

How do I change it in the new Database or do I need to create a brand new database now with zen_ prefix ?

Sigh. Your questions sound like you're overcomplicating it.
Since your old site uses the zen_ prefix, you'll need to use that in your new test site.
You can do that in one of two ways:
a) during zc_install, type in zen_ for the database-table-prefix setting instead of leaving it blank
b) or, after install change the DB_PREFIX setting in both configure.php files to say 'zen_' instead of ''
c) renaming all the tables is pointless since your actual live upgrade will still use the current live database. Your test area is simply for testing to make sure you've got all your compatibilities working etc ... assuming you're following http://www.zen-cart.com/entry.php?3-...d-of-upgrading

[irishshopper]

Have changed the prefix to zen_ in both configure files and can confirm this is the prefix used in the tables in the database but still when I try to run zc_install no upgrade button appearing.

[irishshopper]

Now been able to get the UPGRADE button to appear and have upgraded this.

Site www.irishshopper.ie appears fine but cannot get in to the admin area.

Note have changed permissions of two configure files to 444 and renamed admin folder admin1 but www.irishshopper.ie/admin1 get the standard ZenCart error screen.