"Safe mode: Your client is out of date and incompatible with the Overwinter network upgrade.
Please update to a recent version of Zcash (1.1.0 or later)."
We are aware of the problem. We intended to activate Overwinter in similar fashion as zcash but we didn't release the newer VoteCoin 1.1.0 wallet yet. It will be hopefully in 24 hours.
Version 1.0.0 won't work anymore?
How to be the one with the old version of the CLI wallet 0.1.5?