I am trying to upgrade my Windows 8 Enterpise PC to Windows 8.1 Enterprise everything goes ok
up to the point where the install wizard ask to choose what I want to do with my current data and
files. The problem is I only get to choose one option and that is to erase all previous data.
(A new installation practically)

Thank you in regards

Are you upgrading through the windows store or from a downloaded ISO. From what I understand, if you use the ISO you can do an in place upgrade. The store does not have that option.

It is Enterprise edition so it only works through an ISO or upgrade CD and Volume Licensing, thats why it is so puzzling for me