PhotoShop Installation problem

Thank you so much for your help.

"Do you know how I can get the corrent files to download?"

Go here:

https://helpx.adobe.com/in/download-install/kb/downloaded-older-app.html

"I installed it originally on an old computer that I no longer have. I didn't know to deactivate it. "

Go here:

https://helpx.adobe.com/contact.html?step=STAM_downloading-installing-setting-up_serial-numbers-redemption-codes_stillNeedHelp

and 

and explain that you did not deactivate it on the old computer and that you need to have your activations reset.

I installed it originally on an old computer that I no longer have.  I wiped the hard drive before I gave it away.  Was I supposed to deactivate it?  If so, I didn't know to deactivate it.  Am I just screwed then because I didn't deactivate it?

Yes, the serial number I have is for Photoshop Elements 12.  As I look closer, the tech support guy gave me the installation file for Premier Elements 12.  That must be the problem.  Thank you.  Do you know how I can get the corrent files to download?

Are you sure you have a Photoshop Elements 12 installation file and not a Premiere Elements installation file?

Are you sure your serial number is for Photoshop Elements and not Premiere Elements?

How many computers is it installed on without signing out or deactivating?

I am running on Windows 10.

My serial number is for Windows

" before it was a monthly subscription "

Photoshop Elements never has been and is not now by subsctription.  It it a one time purchase.

What is your operating system?

Is your serial number for Mac or Windows?

Moved to the Photoshop Elements forum from the Photoshop forum.