Hey Arie,
>> "1) Can you use Wybuild also for first time installations?"
As of wyBuild 2.6.x -- yes, but not easily. You'd have to somehow distribute the wyUpdate.exe and client.wyc to your customers. And have them run that. That would download and install your app.
The next version of wyBuild will include integration with WiX, allowing you to generate true installers easily.
In the meantime we recommend using either WiX or InnoSetup to create your initial setups.
>> "2) Is there a link with LimeLM (this because we want to know whether an IP address has installed, and when, the latest update)"
Do you mean limiting updates to customers who have already installed and activated your software? If so, we have an example of that: https://wyday.com/wybuild/help/limit-updates.php