EaseUS Thanksgiving Campaign in 2017 (start on Nov 21, 2017)

[Danielx64]

i think there is way to install now, activate the key and use later.
Basically, activation is stored in registry as far as I remember.

I used to try all this few years back. got rusted now

Yeah you can do an offline actvation as well, you just need to keep a copy of all the details no need to mess with registery.