Not able to downgrade from ionic version 3.7.0 to 3.6.0

Since I’m having problems running my projects ever since the 3.7.0 update, I’m trying to downgrade it to my previous version which is 3.6.0. But after running these commands :

npm uninstall -g ionic
npm install -g ionic@3.6.0
ionic version

It still says 3.7.0. What do I do ?

npm uninstall ionic to get rid of the local installation.
Or better: Revert your git checkout to the version before you upgraded, delete node_modules and run npm install (this will also make sure the plugins are the correct version again)

But of course try to make 3.7. work (see other thread).

Where is this other thread to try and get it to work?

That was Projects not running since CLI update 3.7.0