I want to use my USB stick license on my computer. Whenever i try to make a project the TIA alert me with "License not found". but i have already plugged my USB license in the computer. Attached is the snapshot which confuses me regarding activating the license.

It says
ok - 1 License Key
Used - 0 License Key

How can use this license key please?

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Split from automation floating license transfer.

Rajvir Singh

Alright, i just did that and it worked. Thank you!  
Now if i have to use this license on another computer. Do i have to transfer it back to USB stick and then transfer it to another computer. The same way i did for this one?

 Hello,

I have Simatic Wincc Audit for comfort/Mobile Panels 

Pn: 6AV2107-0RP00-0BB0

I transfered the license from USB to my computer successfully, now what should I do to use this license in my TP1500, because I still have "license not found " on the screen?!

Hi George,

you are using a Runtime License. This kind of licenses has to be transferred to the operator panel. Please refer to chapter 3.3 of the documentation, which you can find at "What information is available about licenses for WinCC (TIA Portal)?".

Kind regards
Stefan