Download the Clearpay extension from the GitHub repository and unzip it.
Magento 1 can be installed in any directory on your server. For the purposes of this document, [MAGENTO] refers to the root directory where Magento 1 is installed.
Merge everything in the Clearpay folder to [MAGENTO]/
Login to Magento Admin and go to System → Cache Management.
Then select Flush Cache Storage
Updated about a month ago