How to test an app with a different SAPUI5 version (2495109)

 With your app running in the browser, open the Technical Information Dialog by pressing CTRL + Alt + Shift + P.

Insert the URL to the required SAPUI5 version on the CDN, as described in the following documentation.

Variant for Bootstrapping from Content Delivery Network

Then press button "Activate Reboot URL". The following popup will appear:

Now refresh the page. A warning will appear indicating that the UI5 is booted from a different source:

 

After accepting the warning, the app will be loaded with the indicated SAPUI5 version. If you refresh again, the app will be loaded again with the original defined UI5 version.