This worked for me last week, but not now.
I go to https://www.piriform.com/ccleaner/builds
click on the portable version
it takes me to the download page for an instant then goes to piriform.com home page without downloading the zip.
Even going to https://www.piriform.com/ccleaner/download/portable/downloadfile
which seems to be the 'click here if the file doesn't download' link, takes me to the home page
Operator error?