I am using photoshop CS06 academic version. So I had it installed on two of my PCs. However, the HDD of one of the PCs crashed, so I discarded the PC without being able to deactivate the Adobe license.
Therefore now I cannot activate photoshopCS06 on my new PC.
I tried at the following LWS site and couldn't do it.
Want to verify and troubleshoot license issues? The Adobe Licensing Website (LWS) provides account information for Adobe Buying Programs customers. Use the LWS to find serial numbers, track orders, view purchase histories, check upgrade entitlements and points, change or add account contacts and information, merge accounts, and download software.
I'm not sure that old version of Photoshop will work under modern operating systems. If you need Photoshop and you have the correct system spec, it might be worth upgrading to the Photography Plans at around $10 a month.
The LWS is for businesses to manage the licenses for their users. You CANNOT deactivate your own licenses, otherwise there would have been no point having a limit in the first place! You can try Adobe Customer Service. Say you need an "activation count reset", and that you have the serial number. Use this exact phrase and repeat it often. Say the product name and version only if asked. You may have to try multiple times.