I have CCleaner Professional Edition on my present computer. I bought a new computer since my present one was purchased in 2009. Do I need to buy another copy of CCleaner to install it on my new computer or is there a way to add CCleaner to my new computer without making a new purchase? Thank you.
Simply download and install the Free version. The simplest way to download the Free installer is from here:
Once installed open it and go to Options>About>Upgrade to Pro.
Enter you registered name and key as asked then click on register.
(The name/key will be shown in the one you already have installed in Options>About>License Information).
There’s more on registering CCleaner Pro (on Windows, Mac, and Android), and what to do if you have problems, here:
If you only have a licence for one machine you should uninstall CCleaner Pro from the old one. You can then put CCleaner Free on that older machine if you want to.
If you have a multi-device licence (CCleaner ProPlus 3-devices, CCleaner Premium 5-devices) then of course you can have CCleaner Pro on more than one device.
That includes Windows, Mac, and Android devices.