How to : download page and save it to /usr/src/lsws/trial.key
 

I have a server with directadmin. I'm newbie

How do i upload trial.key to /usr/src/lsws/ ??

Please request a trial license from litespeedtech web site download page and save it to /usr/src/lsws/trial.key

I login with admin to ftp and can not find folde : /usr/src/lsws/ ????

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also My website use php and mysql + mod rewrite, should i Enable PHP SuEXEC ???

you should save the trial.key file to the installation directory where you run install.sh.

but how do i do that ?? could you tell me more detail ?? how to upload a file from my computer to server by using SSH ??

you can use winscp for file copy over ssh.