Firstly... why the need to re-install? Do you have big problems with the code files?
Secondly, if you do want to re-install, then there are a couple of options open to you... some options will require you to have THE SAME version number as your current set up.
If you don't have product ATTRIBUTES, you could consider using Easy Populate to do a "dump" of all product data, and you could use the TXT file thus generated to "populate" a new install with those products.
If you DO have attributes associated with products, you could (via phpMyAdmin) copy the relevant tables (and there are a few that are relevant) and "import" the contents of those tables into the database of the fresh install. (BUT... your dbase versions must be identical here).
You could also do a fresh install of ZC, using a NEW database (leaving the current database un-touched) and then, after the install, edit the two configure.php files to point to the OLD database. (AGAIN... version numbers must be identical).