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If you are a paid user then, depending on how you updated, your licence information should have been copied across automatically.  You can check here:

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Piriform Homepage - [CCleaner - CCleaner Mac - CCleaner Android - CCleaner Browser - Recuva - Speccy - Kamo] - Product Support

Looking for your licence key, expiry date or download link? Check here first: https://www.ccleaner.com/support/license-lookup
To find out how we protect your privacy - read CCleaner's Data Factsheet.
What's new? Check the latest CCleaner for Windows release notes

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I've repeated this process several times.  The simple fact is that the key Piriform has repeatedly sent me is invalid, and there seems to be nothing I can do about.  I need to reach a 

customer service person.  Their automated systems can't seem to help me. Thanks, Dean Anderson [phone number deleted]

Edited by Dave CCleaner
published phone number on public forum - removed
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  • Admin

@Dean Anderson I just checked your details. Your CCleaner Professional Plus licence key is valid and works - I just tried it myself personally and it activated perfectly.

Note that this licence is for PCs (not Macs). You can enter it in here. 

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You'll need to put in your name (case sensitive and not email address) and usually safest to copy-paste your licence key - common issue is manually transcribing the letter "Z" as the number "2",  the number "1" as the letter "I", etc.

Piriform Homepage - [CCleaner - CCleaner Mac - CCleaner Android - CCleaner Browser - Recuva - Speccy - Kamo] - Product Support

Looking for your licence key, expiry date or download link? Check here first: https://www.ccleaner.com/support/license-lookup
To find out how we protect your privacy - read CCleaner's Data Factsheet.
What's new? Check the latest CCleaner for Windows release notes

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1 hour ago, Dean Anderson said:

I've repeated this process several times.  The simple fact is that the key Piriform has repeatedly sent me is invalid, and there seems to be nothing I can do about.  I need to reach a 

customer service person.  Their automated systems can't seem to help me. Thanks, Dean Anderson [phone number deleted]

Please start a new thread as it well could be a wholly different issue from the OP

 

ADVICE FOR USING CCleaner'S REGISTRY INTEGRITY SECTION

DON'T JUST CLEAN EVERYTHING THAT'S CHECKED OFF.

Do your Registry Cleaning in small bits (at the very least Check-mark by Check-mark)

ALWAYS BACKUP THE ENTRY, YOU NEVER KNOW WHAT YOU'LL BREAK IF YOU DON'T.

Support at https://support.ccleaner.com/s/?language=en_US

Pro users file a PRIORITY SUPPORT via email support@ccleaner.com

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