1. Find the original CD/DVD and serial number. If it was an upgrade, also the old version serial.
2. Install on new computer. Don't have especially high hopes it will all work on the latest Windows 10, but the bits you want might be OK.
3. Try to license with serial number.
4. If the install says too many licenses are in use, you must contact Adobe Customer Service and ask for an "Activation Count Reset". CS6 is out of support and they will try to ignore your request, but keep repeating you are entitled to an Activation Count Reset. Use that exact phrase.
Adobe has removed ALL public download links for serial number programs -links are ONLY available to someone who purchased a download from Adobe . For serial number programs you may download ONLY if you bought direct from Adobe via download -Log-in to your account and click this link https://account.adobe.com/products --click Order history on the left and then the link to your order that will show on the right --and finally click the link "Downloads and serial numbers" that will appear ---as always, write the serial number in a text file AND copy that text file and the ---download file(s) to an external drive (or two) to be sure you have what you need -if you did not buy direct from Adobe via download 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 a disc and don't have a drive you will need to buy an external USB drive -if you bought and lost a disc Adobe does not provide a replacement via download -if you bought a download from a 3rd party vendor you will need to contact that vendor