I have fully licensed CS6 Suite installed on my desktop computer. Adobe CC is asking me to "upgrade" to the newest apps to replace the desktop versions. Will I lose my existing license and/or be required to make additional payments in this process?
A Cloud subscription and legacy CS6 programs are separate... you do not pay anything extra by having CS6 installed, only your subscription cost for the Cloud plan you have
HOWEVER... if you ever stop using a Cloud subscription, you may have problems with CS6... read below
Read Cloud takes over https://forums.adobe.com/thread/2089127 for some ideas (see reply #1)