You may have downloaded the trial version from our website. Since you purchased the app via the Mac App Store you do not need a license code and can install the App Store version of the app by doing the following:
1. Delete all versions of Memory Clean 3 from your computer
2. Open the Mac App Store
3. Sign in using your Apple ID
4. Click the Purchases tab
5. Locate Memory Clean 3 in the list
6. Click the 'Install' button
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