thanks, but no
saving the project did not help, and I'm surprised there is no config parameter to set the path to SDK :-(
I'm kinda surprised that no one can answer a simple question as to:
where one supposed to extract downloaded SDK
If you'd like to use an SDK that is not on the CDN or your own server, you just need to put the SDK in a web accessible place. For example a server of your choosing and/or in the directory of your project.
You will then change the library that is loaded by clicking on the Library node and configuring the base url.