Manually Upgrade Extension
I would suggest you to uninstall the previous version first and then to install the new version - just replacing the files will not do anything. 

So, Please replace your previous version of extension in the extension folder - and uninstall it first.

Then do replace your new extension and install the same - that should work as you excepted 

Ref: https://docs.civicrm.org/sysadmin/en/latest/customize/extensions/

I guess this helps !!!!