i have purchased S3 lic （by PayPal）but account status now still DEMO lic
after my purchasing it showed something i should waiting （PayPal to LFS）？
what's that meaning?

See this : https://www.lfs.net/forum/thread/92909-Bought-S3-and-it%27s-still-S2%3F-%28Solved%29
Looks like same issue is happening with you

Quote from Flotch :

See this : https://www.lfs.net/forum/thread/92909-Bought-S3-and-it%27s-still-S2%3F-%28Solved%29
Looks like same issue is happening with you

well thank you! i'll try some ways

Are you solved it now?

Yes, he did solve it. Look under his name, it says S3 licensed.