Click "check out" It's appear "Page not found"

Please help,

The problem about when i click check out (in order to process the payment after add the product in cart) it's suppost to link to the payment process(Paypal)but it's not, it's appear "Page not found", i think it's about the web link to paypal.

Please help suggest me how to get work about link this check out process to paypal, how to solve this,

Thank you in advance for your kind help,
Alialicha

Please check on www.bellebridaldress.com try by add some product to cart and click check out, you will see

"Page not found

The page you are looking for might have been removed,
had its name changed, or is temporarily unavailable.

Please try the following:
If you typed the page address in the Address bar, make sure that it is spelled correctly.

- Click the Back button in your browser to try another link.
- Use a search engine like Google to look for information on the Internet.

HTTP 404 - File not found"

Its actually supposed to link to the checkout page and the files seem to be there , I think something might be wrong with the host.

How can i solve this problem, please pleas help me, what should i do????

Thank you.

You should probably first try to upgrade opencart to the last version , and if that still happens , contact your host.

Some of your links are pointing to ....com/opencart/upload/index.php.....

No idea what you have done to do that though.

Still don't know how to solve this problem!
Please help.

it appears to be secure links so check the config.php file for the error.