As Bhikkhu Pesala pointed out earlier, you can use the Copy Data Files to User Data Folder available through Options dialog → Advanced tab.
This way you keep the original files. On updating FontCreator it is possible new data files will be installed, but remain unused as FontCreator will always look for the files in the user data folder.
With the update we released earlier today, FontCreator includes data files for Unicode 10. If you did copy the data files with a prior release, then you still use files for Unicode 9 or older.
Do delete (or rename) files within the user data folder if you want FontCreator to use the original files.