What about just downloading the SDK and just open it inside Google Chrome?
1) First download the needed SDK
You can choose betweeen the UI5 Runtime, the UI5 Runtime Mobile or the complete SDK.
For getting docs and everthing around UI5 download the complete SDK for developing browser and mobile applications.
After extraction you will get a folder like this
Normally you would like to open "index.html" directly from browser using an URI like this
For that reason you normally have to use a web server like Apache or Nginx to get your hands on the SDK, but you can also use the Google Chrome browser to start the SDK by using a special command line parameter.
On windows, the easiest way is to create a shortcut to "chrome.exe" with the following target:
"C:\Users\USER\AppData\Local\Google\Chrome\Application\chrome.exe" --allow-file-access-from-files file:///C:/UI5/sdk/index.html
Thats it! Start your chrome browser with the symbolic link and you will be able to run it from the local file system.
Special notice on SAPUI5!
The SAPUI5 SDK is also delivered as a WAR file that can be deployed on a J2EE Server like "Apache Tomcat". It includes a special servlet doing special tasks like cache-busting and resource handling.
This is only thought as a SDK quickstart to get your hands on it. You will have more fun with dynamic data services on the server side. You can use a classic html server like Apache or maybe use node.js fot that job.
In the node.js section of this site you will find the needed server script to run static files from inside node.