There are still a few ways to upgrade your Template files, however:
- Use the free File Upgrader add-in.
- Make a new Family using the RFT file that you want to upgrade. Then, save as RFA. Navigate to the folder, then rename the RFA to RFT. This is a slow, one-at-a-time method.
Please comment if you have any tips or workarounds related to upgrading Template files.