T-Man

If you are looking for a way to manage Keys being sent when a customer purchases an item, there is an Add on for WHMCS called Licensing Manager. It will create the license or unlock key and send it to them at the time of purchase. You can create code to check with the server to see if it is valid or not and when it will expire. Software Licensing - WHMCS. If you are looking to have a download for a file for one customer, then it would be under Support | Downloads and while it isn't specific by customer you can create a customer specific item or add on product that the customer has that will have the specific download only for them. I know the post is old so you may have already figured some of this out. Hope it helps.

When going to Support | Downloads and creating a new download, what is the limit in size of the file that can be downloaded? I have small exe, zip and PDFs that are a mb or less that work fine. Larger files that are 130mb fail. Is there a setting I need to change for PHP.ini to get it to work or is this a limitation by the program to use the download function? I am fine with uploading the files through FTP to the downloads folder, that isn't a problem. The issue is when a client clicks on the download link it comes back with ERR_Invalid_Response with Edge and with Firefox it says file not found. Only for those that are large.