You cannot find a safe, official download link on random third-party forums anymore. However, for customers.
If the installer doesn't detect CS6, copy the Noiseware.8bf file to: C:\Program Files\Adobe\Adobe Photoshop CS6 (64 Bit)\Plug-ins noiseware photoshop cs6 64 bit link
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If you are looking for a free way to reduce noise without a plugin: Installing the plugins in Photoshop CC (Windows 7 64 bit) You cannot find a safe, official download link