Logon to your Google Mail, via Chrome and look for the below option on the address bar and choose Allow to Open all e-mail links.
Ensure, Google Chrome is closed and follow the steps below:
1. Open C:\Users\<your username>\AppData\Local\Google\Chrome\User Data\Local State with Notepad (or, any other text editor).
3. Launch Chrome, visit Gmail and Sign in.
4. On the Windows System > Click Start > type "Default Programs" > Open "Associate a file type or protocol with a program" > lookup for "MAILTO" with GoogleChrome > Choose the program to open Mail using you Google Chrome Browser
5. Launch Lifesize Cloud for Desktop > Go to Invite and click "Invite" and choose the option "Email and Invitation" and it should redirect to your Google Mail account in Chrome.
What if, I don't see the Protocol Handler as displayed in the first screen:
And Now try again.