Hello,
what I recommend to all customers is to create a specific folder on their HD to copy the models they want to modify / test / update... I made this a long time ago when I was using NI softares and it helped me several times.
Using like this, even if you download a new revision of THCC, you will always have your examples with your modifications at the same location.
So in case of troubles because you made too much modifications, i made it several times to "adapt a model", you will always be able to recover the right example.