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## Before Troubleshooting: Preparation Checklist
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### Step 1: Re-enter License Key
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### Step 3: Log Out and Log Back In
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### Step 1: Open CCleaner Settings
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## Troubleshooting Table: Quick Fix Reference
| Issue | Cause | Solution |
| License not valid | Typo | Re-enter key |
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| Features locked | Sync issue | Log in again |
| Error persists | Outdated app | Update software |
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After fixing:
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* Always copy-paste license key
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## Best Practices for Smooth Usage
To keep CCleaner working properly:
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**Pro tip:** Always validate your license immediately after installation.
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