About CS6 Perpetual License, How long can be use?

Today one of adobe reseller told me that CS6 CLP can only use 2 years!

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That's correct. CLP is a special licensing arrangement with Adobe

https://www.adobe.com/au/howtobuy/buying-programs/clp-tlp.html

If you have a legitimate perpetual license for Photoshop CS6 and it works on your computer and you want to continue using it you may want to lock down your system; because new hardware, OS updates, … might change the setup in such a way that Photoshop CS6 will not run anymore. 

That's entirely up to Microsoft. It no longer works in MacOS.

CS6 is ten years old, long dead and gone, and has not been supported or received any updates since 2015 or so.

Note: If you get any offers to purchase CS6 now, it will be a pirated and illegal version. It has not been legally available for many, many years, but pirated copies still circulate in pretty astonishing numbers. Don't accept these offers as genuine!

Hi

You may want to read this

Adobe stopped selling CS6 entirely several years ago – here’s why… So the CS products are not being made by the company, nor legitimately for sale through any channel in any country, from any vendor or reseller

https://prodesigntools.com/dont-buy-adobe-software-on-ebay-craigslist-or-amazon-marketplace.html