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How to update from CREO 4.0 to CREO 5.0 .
We need a lot more information than just that.
Just a few off the top of my head are:
Do you have an account on PTC's site and is your maintenance up to date?
If it is, did you download the new version?
Are you a student or working for a company?
Are you the Creo admin?
Do you have admin rights or doe you even need it?
Etc...
... or contact your VAR (Value Added Re-seller). A lot of times they can walk you through it.
You can find PTC's software reseller in your local region here: https://www.ptc.com/en/partners/find-your-partner