But after I download it it says trial version? What should i do?
How to reinstall on a new computer or on a computer that crashed, it's clearly explained in the installation guide, named fsdt_install_guide.pdf, to be found under the fsdreamteam folder (under the main Flightsim folder) after installing the Trial. Reinstallation is explained from page 12.
For those that don't care reading manuals, there's a sticky thread in this forum section, which should be impossible to miss, since it's on the top of the forum, which is named:
Reinstallation after system upgrade or crash, please READ!http://www.fsdreamteam.com/forum/index.php?topic=649.0