since the student edition is free for download I think that YOu only have to download and to install after uninstalling Your ST8
I don't think that there is any "Update" function since this also is not available for any other license type of SE
After reading your text... opened this link goes back to the forum.
Was there a question in there? Why would you place a link that loops back here??
You need to go here for Student Edition >> https://www.plm.automation.siemens.com/plmapp/education/solid-edge/en_us/free-software/student << and fill it out to move to the next stage for download.
Design Manager Streetscape Ltd
Solid Edge ST10 [MP3] Classic [x2 seats]
Windows 10 - Quadro P2000