mike,
1. In CM, select asset that requires updating and copy asset name
2. minimise CM so you are at desktop & create new folder, then select rename & paste asset name to it.
3. Maximise CM & open asset for edit in explorer, copy all files then revert asset or re-commit it.
4. Minimise CM so you are at desktop, paste files into the folder you created, open config file & up the kuid suffix number to match the one in the 3.8 version & save.
5. Maximise CM, go to top left dropdown menu & select 'Import CONTENT', navigate to the folder on the desktop & import.
Your 3.7 asset will now update & CM will no longer tell you to download the 3.8 version.