how to find host password

[justinm001]

Hey all,
 We recently took over a client that another vendor also used teamviewer and they installed host version of the software on all devices which doesn't show the password for us to connect.  We normally just use a quick support version and have them download each time, but they're unable to use it because they only have the option to show running teamviewer, which doesn't show the password.

Is there any way to find the host password or change all passwords on the network without going to everyones pc?  I'm hoping there's a registry key or file we can just find on all remote computers and change.  It'll be hard to find every desktop and get it switched physically.