I have bought InDesign CS2 many years ago and used it till now.
After crash of my Windows XP I can not activate new installation. I have read this: Error: Activation Server Unavailable | CS2, Acrobat 7, Audition 3, but there is no Polish version.
What can I do do use CS2 in Polish version?
It's unlikely there is anything that they can do in the other forum, but the OP might want to read this old article at InDesign Secrets: Change InDesign’s UI Language with Free App | InDesignSecrets. Buried in the comments are registry settings for changing the language for windows users that might, and that's only might, work.