when you install the "free" version, so ,no, you can't have both versions installed on the same PC.
You can change the registry settings so it's not locked to the Cisco server, but then you might as well just have the "enterprise" version installed and just edit the internal server settings to use the above URL if you want to make it behave as the "free" version.
There's no difference, clientwise, between the two, the server settings determines which server it will register with, and provisioning settings will change accordingly.
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Cisco Jabber Video for Telepresence and Jabber.com
Not sure if you've seen this or not, but you can have the enterprise client installed and then populate it with the Free Jabber config manually. It won't give you simultaneous applications, but you can update your settings as needed if you want to swap between connecting the enterprise jabber client to your company's infrastructure or the Free Jabber cloud infrastructure. Instructions are found at this thread:
The Jabber Video application can operate in one of three
modes:Connecting to an internal VCS infrastructure back endConnecting to
the Cisco WebEx Telepresence subscription cloud serviceConnecting to the
Jabber Video cloud to enable calls to WebEx Telepres...
Yes. You can install the Jabber Video application from
ciscojabbervideo.com. on more than one computer. To access your account
on any computer that has the app installed, simply sign in with your
email address or video address as the username and your acc...