Back in the day, Pro/E went by numbers - Pro/E 1.0, 2.0, etc. That was true up to 20.0 around 2000. Then we got Pro/E 2000i, then 2000i2, then 2001 and then we started with the Wildfire series - WF, WF2, WF3, WF4 & WF5.
Creo was announced while Pro/E WF5 was the current version. Creo is really like saying Microsoft Office - it's a suite of applications not simply a new name for Pro/E. All (I think) PTCs 'apps' were renamed immediately, although none of them (that I'm aware of) actually changed. So:
- Pro/E WF4 -> Creo Elements Pro 5.0
- CoCreate -> Creo Elements Direct (not sure the version)
- Product View -> Creo View
Then, with Creo 1.0, we got some native Creo apps. These are new versions, not rebranding of old.
- Creo Parametric 1.0 replaced Creo Elements Pro 5.0 (formerly Pro/E WF5)
- Creo Direct 1.0 is a new direct modeler (CoCreate continues along side as Creo Elements Direct. They are not the same thing)
- Creo View 1.0 I believe is the next version of Product View.
- Creo Simulate 1.0 is the next version of Mechanica. I don't remember if Mechanica got renamed right away or not.
There may be others, I'm not sure. Creo 2.0 brought new versions of the above. There are more apps, some new some rebranded old ones, and even more coming in the future.
So, you need to find out what version of Creo Parametric the company is using. Are they still on Creo Elements 5.0, Creo Parametric 1.0 or Creo Parametric 2.0? They are sequential. If you get a newer version than the rest of the company, no one else will be able to open your models.
Oh, and yes, PTC created a confusing mess when they did this.