i whish buy limewire PRO for $18.88 but my question is this price is only one time or i need pay $18.88 per month ??

The price is paid once and it will include the right for 6 months update of the program as well as tech. support. After that you can update for a smaller fee (something around $ 14 - $ 15 for another 6 month); but you don't have to.
Just make sure that you save the installer.exe of LW at a save place in case something happens to your installation.
And please download and purchase from the official site, so you'll get the real LW Pro.
http://www.limewire.com/

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"Never Argue With An Idiot. They Will Drag You Down To Their Level, Then Beat You With Experience"

And bookmark your personal pro download page.

ok thanks i still think about this because i only buy limewire pro for donwload progs so all prog is come content removed and i cannot donwload what i wanna

Well, downloading programs from the net is rather risky, to say the least.
I guess what happens to you is that your Security Programs detect trojans/Worms/Viruses in those files and therefor remove them.
take a look here:
Files you should be aware of

__________________

"Never Argue With An Idiot. They Will Drag You Down To Their Level, Then Beat You With Experience"