1. Depending on your Internet Explorer security settings, you might be able to select 'Run' to allow the HTML Application to execute.
2. If you are using another browser you will you likely have to Download the file (SkypeUIController.hta) and run it on your local file system.
3. If all else fails, right-click the link and Save link as . And save the SkypeUIController.hta file locally and run it. Even then you might have to Right-click | Properties and Unblock it.
Warning: this script modifies the Windows registry (if the current logged on user has permission to do so). If you are not familiar with editing the registry, or are not sure, do not attempt to run it. I do promise this script does only what is advertised (view the source yourself right-click and save the script to file and have a look) and cannot cause any harm as far as I know!
Specifically the script will do the following:
1. It checks to see if the Skype for Business UI registry value exists (e.g. HKCU\Software\Microsoft\Office\Lync\EnableSkypeUI).
2. If it does NOT exist, it creates it with a default value of 1 which is the binary value for enabling the Skype for Business client UI experience.
3. If the registry value DOES exist, it changes the value to be the alternate UI. For example:
o If the value is set to use the Lync UI (i.e. 00 00 00 00), it will change the value to Enable the Skype for Business UI by setting the registry value to 01 00 00 00.
o If the value is set to use the Skype for Business UI (i.e 01 00 00 00), it will change the value to Enable the Lync UI by setting the registry value to 00 00 00 00.
More information about configuring the Skype for Business client experience can be viewed here: Configure the client experience with Skype for Business.
For the latest Microsoft Lync client updates see the Microsoft Update Resource Center for Microsoft Lync.