Greetings Takashi ,
When you load the file "DemoFactorySimulator.opf" in Kepware it overrides the project content .
So to connect to ThingWorx Server you need to provide the following details in the Kepware Project Properties :
1. Host : It will be the hostname of your ThingWorx Server
2. Port : Port at which ThingWorx is running
3. Application Key : Search for Application Key in ThingWorx Composer for the thing specified in Project Properties
For example i am launching ThingWorx using this URL : http://localhost:8080/Thingworx .
So the host would be localhost and port will be 8080.
Once these properties are updated , the Kepware will again try the connection to ThingWorx Server using above properties .
Also in Express version, there are licensing limitation on how many tags can be used (500 tags I believe ), number of trends (10 trends), data retention (7 days), etc. The idea is to allow customers or potential customers to quickly connect Kepware and evaluate the apps on their own. For longer trial version or paid version, customers should work with Sales Rep.