Im buying a new laptop. can i transfer my subscription to my new one from my old one
Yes.
Using ccleaner 6.12
On old computer go to options>license key and make note of the license.
On new computer download free version. Go to options>license key. And enter your license.
You can easily/quickly download the latest installer at any time form here (Tip, use the 'Slim' installer).
https://www.piriform.com/ccleaner/builds
Once downloaded double click it to install CCleaner Free, then if you have a valid licence open CCleaner Free and enter the key to register it as Pro.