Just come across this situation yesterday when rebuilding a pc.
When I tried the CS6 Indesign plugin for FusionPro it would NOT work with Indesign CC.
Luckily Adobe still allows CC users to download CS6 - just open the CC Application Updater, find the product (Indesign CC), click on more information which will open a web site. On that site, select CS6 from the dropdown & hit the install button. it will do a small update on the Application Updater & start downloading CS6.
Steve..