My hard drive crashed and I lost my adobe CS6 and I can't find my discs

Won't help the original person, but losing everything could have been prevented

Hardware crashes or virus infections or simple software problems happen, so you should buy AND USE software to make a full backup of your hard drive to an external USB hard drive... plus, making step-by-step backups during a new setup or major program addition makes it easy to go back a step if something doesn't work... I have had to do this once when a program install didn't work properly (a different program, not Adobe) and I had to do a restore due to my drive being SO messed up that I couldn't even uninstall the bad program
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This backup and then restore is, of course, only to the same computer with a new drive (or the same drive as long as you don't mind writing over everything) since doing a restore to a new computer requires extra steps due to Windows and many programs having activation information that is keyed to your hardware (which is why Windows will force you to RE-Activate if you change very much hardware)
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The product I bought and use is at http://www.terabyteunlimited.com/image-for-linux.htm
Note that I get NO benefit if you buy the program, I only use it and like what it does
Version 3+ allows restoring to a larger drive and expanding the partition to fit
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Image runs off of a bootable CD or USB Flash Drive via Linux (the Zip you download includes a program to make the CD or USB, the program uses less than 1Gig) and it reads EVERYTHING on the drive, even the hidden registration information, so everything is restored when needed... and you may not only restore the image over a messed up install, you may restore to a brand new drive in case of a hardware crash, and not have to re-install anything
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I do a backup a couple times a year to a second internal drive... the backup of my C drive is 'about' 45Gig in one file... depending on the space used on your C drive you should be able to do a backup to a USB flash drive that has enough capacity... 128Gig flash drives don't cost a lot
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I have actually done this restore one time... when a program I bought had a faulty installer that totally mangled the Windows registry... I had done a restore before installing the bad program so I did not lose anything when I had to do the restore

I'm sorry for your loss. Without the original hard drive, you can't deactivate your old installation for installing on a new device.

MODERN OPTIONS:
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FREE Acrobat Reader
https://www.adobe.com/acrobat/pdf-reader.html

FREE Online PDF Editor
https://www.adobe.com/acrobat/online/pdf-editor.html\

Paid Acrobat (Standard, Pro or Studio)
https://www.adobe.com/acrobat/pricing/compare-versions.html

Photoshop Elements or Premiere Elements (3 year license, no subscription needed).
https://www.adobe.com/products/photoshop-elements.html

Creative Cloud Annual Photography plan. Includes the following:
- Photoshop CC and Photoshop on iPad
- Camera Raw
- Lightroom on desktop, mobile and the web
- Lightroom Classic
- Portfolio website + hosting
https://www.adobe.com/creativecloud/photography.html

FREE or Paid Adobe Express
https://helpx.adobe.com/express/using/express-overview.html

Creative Cloud Bundles & Single Apps for mobile, web & desktops
https://www.adobe.com/creativecloud/plans.html

Make sure your computer meets the minimum CPU & GPU requirements. Most current Adobe apps work on these systems, no more than 2 versions back:

• Windows 11 (64-bit) versions 24H2, 23H2; Windows 10 versions 22H2, 21H2;
• MacOS Tahoe 26, macOS 15 (Sequoia), macOS 14.7 (Sonoma). 

- https://helpx.adobe.com/creative-cloud/system-requirements.html

For serial number programs you may download only if you bought direct from Adobe
-Log in to your Adobe account and click this link https://account.adobe.com/products
--you do, of course, need to log in using the account you used for your purchase
--IF a download is available there will be a Download button under the program name
---download file(s) to an external drive (or two) to be sure you always have what you need
---since Adobe DOES sometimes remove very old downloads from their file server
-if you did not buy direct from Adobe you must find your original install
-if you have an Education or volume license you MUST use your original media
--the link for an Education or volume license download is not available at all
-if you bought and lost a CD/DVD disc Adobe does not provide a replacement

you can check your account for a download