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I think I should download it on another spare (noncrypto) notebook anyway. if something wrong you never know immediately , but would be sleeping for a while lol anyway I hope the best for all but wanna double warn people to always have asecond notebook for any new software .
is there a deadline for such airdrop?

The rewards will be distributed until there is rewards to distribute and it depends on what reputation of Steemians attest their account, also depends on how much other distribution methods are distributing and how much will the GBYTE be worth during next months (because the rewards are fixed to dollar).

I wrote more about it there https://steemit.com/byteball/@tarmo888/how-many-gbytes-is-20-dollars-and-how-many-steem-users-can-get-byteball-rewards

That's always a good way to go about it.

No given deadline yet from what I've heard!