To upgrade from the LITE to the full version is relatively straight forward.
There are some restrictions you need to be aware of however.
You can only keep your database, template files and the config files. All other files must be removed from your web space. So if you have made changes to your .ASP files these will updates will need to be manually migrated across.
You can use a program called Winmerge for this and you can download this for free from http://www.winmerge.org
Step 1. You need to make a back up of your LITE store first so you have a copy safely stored.
Step 2. Upload the new full version in your web space where you will be working.
Step 3. Once you have the site uploaded using your ftp program now move across from the LITE folder to the full the following files and folders:
a. /config/shop$config.asp
b. /admin/config/shop$config.asp
c. /templates/
d. /database/yourdatabase.mdb - this is only if you are using Access. If using SQL Server or MySQL you do can bypass this step
Step 4. Move a copy of your shop$config.asp file from the CONFIG folder of the LITE install and place it in the UPGRADE folder of the full version you have just uploaded.
Step 5. Run through the Upgrade Wizard - Do NOT go through INSTALL Wizard as this will remove your database changes.
Step 6. Test your site to ensure everything is working smoothly.