One-Page Checkout [Support Thread]

[lat9]

I am using zencart1.55F version
Installed one_page_checkout-2.1.2
There is a 155f file in the downloaded file. Must it be uploaded and overwritten?
What's the use of two files in a folder
urgent

If you mean that there's a /155f sub-directory in the installation zip-file, then: Yes, those files should be copied to your store's file-system, as identified in the link specified in the OPC readme: https://lat9.github.io/one_page_chec..._or_later.html