I suppose that the object expected is the "initializeDemoPushPage".
All demo applications provided by Lightstreamer import the "misc.js" source file,
which contains the "initializeDemoPushPage" function.
I suppose that this import fails in your unsuccessful installation;
please check where you placed "misc.js" and the way you import it.

Note that the relative path to be supplied to "initializeDemoPushPage" is:
from the directory which contains your pushpage to the directory which contains misc.js;
hence, it is the same path you use in the <script> block through which you import "misc.js".

By the way, this seems not related with Windows or Linux (at least, not in a direct way).