In the installation process I get error:
Error opening file for writing
0\CCleaner.exe
I'm working with is a local administrator.
OS Windows 10 Pro, 64 bit.
I found the cause.
If, during installation, click on More, you can see that the default program is not selected the installation folder. Instead of the name of the folder is "0". See the screen shot.
If you select a folder, then everything is OK.
Glad you got it sorted, also your screenshot and clear explanation may help others who have the same issue