"Sorry if I still don't find an answer, but anyway," - the issue @Valentina ♡ is that you aren't hearing the answer you want so you keep asking the same things in the hopes that reality will change.
You've gotten the same answers from several posts from multiple Adobe Community Experts. The issue now is - you aren't listening.
I'm not going to devolve into a discussion about personal finances and situations. I'm sorry that you find yourself unable to afford Creative Cloud for $9.99 ($12 eu) a month. The fact that you keep trying to purchase 10 year old software does not match your request to learn "professional" software. $1,440 Eu is a 10 years worth of monthly subscriptions.
At this point your best option is Photoshop Elements. Your reasoning for not purchasing Elements (I read through ALL your previous posts) was that the CS6 tutorials didnt match Elements. The solution is to stop with the CS6 madness. I'm not sure where this obsession with CS6 as the end-all for Photoshop came from, but current Photoshop Elements is more advanced and up-to-date than CS6. Purchase Elements and follow the Elements tutorials.
"If I purchase photoshop cs6 from second hand, with a licence, Adobe don't let me use it? Even if is original? I will try to contact Adobe but I need to ask to the main of Adobe." AGAIN - Adobe will not support CS6 or activate a second-hand (even if it is in good condition) - you can't ask "Adobe to dispence me". Do not buy CS6. Contact Adobe directly if you want - you will get the same answers. CS6 is unusable and you'll need to subscribe to Creative Cloud or purchase Elements.
... View more