Download the fitting Imagick-Packet from this source: Install the ImageMagick PHP extension in Windows | mlocati – Michele Locati
Be sure to select the fitting Verson Thread Safe or Not.
Unzip the Package.
Copy php_imagick.dll into your php-root/ext-Directory. Copy all the other DLL-Files directly to your /php-root directory.
Add extension=imagick to your php.ini file. Restart your WebServer or your comand shell. Enter php -v in your command shell and check that there are no errors.