I started zc_install to upgrade the database, and got this far:

"If you wish to change the database table prefixes, enter the
new prefix.
Using an already-existing table prefix will corrupt your database."

Ive read the threads, but none seem to clear up this query.

If I proceed with the update allowing the "zen_" prefix to go ahead, corrupt the database,
then copy the 279 database files back onto the "mysql" folder on the server, will this restore the database
and overcome the corruption,
My existing database files have the "zen_" prefix.
OR
If I use another, eg "zn_" as a prefix,
do I then edit each of the 279 (MYI/MYD/frm) files in the
files I downloaded, to make the prefix "zn_", and copy these into the "mysql" folder on the server?
(My host only allows one database.)

Hope someone can help, Thanks
kevin_a