Should I install?

[RescoCCC]

Is Zen-cart working smooth with Paypal?

It works perfectly with PayPal.

if the buyer doesn't click back to my website after completing the payment

Zen cart automatically redirects the user back to the web site.

[usernamenone]

It works perfectly with PayPal.
Zen cart automatically redirects the user back to the web site.

Actually the auto return is a setting in your PayPal account

Instructions are:

In PayPal choose My Account then Profile then choose My Selling Tools from the left side box then Website preferences then

Bring customers back to my website after they pay with PayPal. Then choose Edit

Auto Return on
The return path is

https://www.yousite.com/index.php?main_page=checkout_process

Then make sure all your other options are answered correctly.

Change the site in red to your site.