new license after motherboard change ?

I'm new to this forum, but I think I might be able to help you out. So, when you change your motherboard, it can sometimes cause your system to register as a new PC, which is a pain when it comes to licensing. :unamused: You might need to contact the software provider directly to get a new license or activate your existing one. On a side note, I checked out that link you posted for the top motherboards for Ryzen 7 5800x at https://finalratings.com/top-3-best-motherboards-for-ryzen-7-5800x-which-one-is-right-for-you/, and it looks like some pretty sweet hardware! I'm actually in the market for a new motherboard myself, so I might have to check those out.

I have never had Lightroom 6. But I believe you can go to your account information and find a list of active devices and deactivate a device. After doing so that will enable you to activate a "new" device even though it is the same one.

You can't contact Adobe because they don't support Lightroom 6 at all anymore. It's out of production, ancient history, not on the Adobe radar at all. You should have your serial number stored somewhere. Check your account to see if it's registered in your account information. That serial number, which is 24 digits, the first four being 1160, is what you are going to need in order to activate your Lightroom.