What version of Photoshop?
Generally, depending on the version, you have to purchase the software to get a serial number or you have to buy a subscription to license it.
When I get that download on the website will be able to, but I can't find
sorry ，my english is poor，can you say simple please
I can find it using the following steps in the US:
Go to www.adobe.com
Type Photoshop CS6 (or Photoshop CS6 Extended)
Click Buy Now
I feel I was cheated, I landed a download site, they say as long as thedownload will have the serial number free, now the official said to charge, oh.....my heart was hurt.
but thanks for your answer
Photoshop is not free. You can try it for free for 30 days. After that time you have to pay.