Is the serial number six groups of 4 digits, with no alphabetic characters (answer YES or NO, do not post the number here)
Where did you buy Lightroom from? Have you contacted them?
There aren't adobe phone in Spain. I can't contact with them.
I buy lightroom from Spain.
You didn't buy Lightroom from Spain (that's a country). You bought it from some vendor, you might want to try contacting the vendor who sold you Lightroom and talk to them about it.
You can always contact Adobe Live Chat at Contact Customer Care
Do you get an error message when you try to enter the serial number? If so, what is the exact unedited word-for-word error message?
I bought from Adobe Spain web
The message is:
Invalid serial number