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open robobhelp>ciick help>updates..
Won't that just apply RoboHelp 2015 service releases?
If that does prove to be the case, install RoboHelp 2017 trial version and
then log in with the Adobe ID linked to the subscription. I'm told by Adobe
that will pick up the fact you have a subscription.
I'll be interested to learn how you get on.
(i don't know about robohelp specifically. it could work differently than other subscription programs, but the others would update to the latest major version.)
in any case, it's worth a try.