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No, the common Office 2016 which i buyed. But i also just learned from Microsoft helpdesk that it was a version for developers, so they advised me to change it for 365 ( € 10.--/month). The seller advised me to leave it just that way, because it's "harmless".
I'm giving you a screen shot and the URL to go to that site:
Is the one on the far right what you bought? If so, it's not a developers' edition. It's just a standalone version of Office that doesn't get regular updates.
Edit: Oops! Buy and Compare Microsoft Office Products | Office
Rakuten in Germany is selling Office 2016 very cheap, varsio.nl a bit more expensive, sometimes about € 20.-- !
but i think i will not bother about those "updates" and just leave it.
Of course, I don't know anything about that site, so I can't say. Are you sure they're selling legitimate copies of Office 2016?
The Microsoft chat-helpdesk controled the 25-reg.number and then informed me those were meant for developpers. I think i will just leave it this way so far.As a matter of fact they are legitimate.