I bought the paid version of CC specifically to scan for duplicate photos on the 256 GB SD card that I could free up space on the card. This option is not available as advertised. I can tell that CC recognizes that an SD card is present, but that is it.
The other options the program suggests look to me like they could turn my phone into a brick. I will probably have to use a PC to clean duplicate files. 0nline and forum searches to address this issue have not worked out so far.
At this time, CCleaner for Android does not affect your SD card in any way - it can only perform its tasks on your device's internal storage (as that's where apps and their data will most commonly be in modern versions of Android).
Since you mentioned that was the specific reason you purchased the product, please feel free to reach out to our support team at support@ccleaner.com if you would like to inquire about a refund, we'll be happy to get that sorted out for you.