CreoView won't start from Windchill (or browser) by thumbnail nor 'open in CreoView'

Version: Windchill Below 11.0

Use Case: I want to open visualization of parts and assemblies on Creo View directily by Windchill. Our Client uses Creo 8 so that's what we use. I have just installed Creo 8 with everything in it (Creo View Express 9.1 included).

Description:

When trying to open a Creo View visualization by Windchill either by clicking on thumbnail (the thumbnail works just fine, zooms and rotates) or by Open in Creo View option,, this happens:

- On Windchill integrated in CREO: it just pops a IE error webpage that says its not possible to open this webpage, "Some content or files on the webpage require a program that is not installed". (windows_browser_type is now ie_browser, but was chromium_browser before and nothing happened)

- Windchill on Chrome it pops up a error message that says "Get an app to open this Creoview link."

- Windchill on Edge nothing happens.

Creo View Express 9.1 opens normally when opened standalone.

What should I do? What am I missing?
Thanks!