Hi Amber,
EP4 has been completed forked from other/earlier versions so you can install EP4 along side them. HOWEVER!!!! There are some differences in the import files and they are not directly cross-compatible with other versions!
To uninstall your old EP version you would need to do two things:
1) Run the SQL uninstall code in Tools -> Install SQL Patches
2) Use a FTP program or the file manager from within your website's Cpanel and delete all the old files.
You have to be very careful doing both! You don't want to accidentally delete some key zencart php file!
-chadd
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