Photoshop CS6 upgrade to Photoshop 13 - installation issue

CS6 is on life support. But it can still be installed & activated providing you have the following:
1. your original media (disks or downloads) that you received at purchase and a way to read them,
2. a legitimate serial number for that version, language and platform (Win/Mac) and if it was an upgrade, a qualifying serial number from an older product,
3. an older operating system that can support legacy 32-bit apps.

NOTE 1 : Creative Suite installers won't work on macOS Sierra, High Sierra or Mojave without terminal workarounds. See the help article below.
https://helpx.adobe.com/creative-cloud/kb/install-creative-suite-mac-os-sierra.html

NOTE 2: Legacy Creative Suite is discontinued & unsupported. Use at your own risk.

That said, Photoshop CS6 (May 7, 2012)

• The last update for Photoshop CS6 was 13.0.6 (macOS) | 13.0.1.3 (Windows) for perpetual/boxed licensed product.
• There was a 13.1.2 (macOS/Windows) for Creative Cloud members only.
• The most current update of Adobe Camera Raw for Photoshop CS6 is 9.1.1

Moved to the download and Install forum, from the Photoshop forum.

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@Jens15B9 wrote:

I tried to update my CS6 to 13 as per advise from Adobe help desk.

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Can we ask how you contacted Adobe Customer Care (not "Adobe Help Desk")?

https://community.adobe.com/t5/creative-cloud-services/how-to-contact-adobe-support/td-p/11875703 
(or send a tweet to @AdobeCare)

As others have said, CS6 and 13 are the same, so we need to confirm you were actually talking to Adobe.

the help desk tells me that I want to install non genuine software.

Scammers purporting to be Adobe will sell pirated software.

~ Jane

They (edit: meaning »Adobe«) switched to CS after Photoshop 7 so isn’t Photoshop CS6 Photoshop 13? 

»I tried to update my CS6 to 13 as per advise from Adobe help desk.«

What exactly was the problem you were trying to solve? 

Are you trying to transfer your license to a new computer, drive, …? 

And it seems peculiar that the help desk would even provide advice about an obsolete Photoshop version. 

What do you do excatly? 

What do you mean with "... to 13". To which version do you try to update?

Which operationg system do you use?