Convert old ALL files

Hello all.

I’m using Cubase LE AI Elements 6 & need to open up old ‘ALL’ files I’ve found- I’m talking 15 year old stuff I thought I’d lost. Well happy;)

I’ve downloaded cubase se 3 as suggested (the version I used at the time) in order to convert them.

Do I need the original se 3 license (of which unfortunately all details of it are lost)

how can I authorize it? Can I somehow use the Cubase Elements license?

Thanks for your time…