When clicking the download button in the User Portal, the web page is re-directed to the downloadpxy.php page.
This page is a blank white page and nothing further happens, no download begins.
A character in the file name is disrupting the download process.
Most likely the file was copied to clientdrop folder and there was a problem in the file name itself
(eg hidden/abnormal ASCII codes in the file name).
Re-name the file without any spaces or special characters.
Eg: "download - me.txt" to "downloadme.txt".
Note: You only need to do this to downloads that are not working.
If the download is already working there there is no need to change anything.