I cross-compiled new Windows binaries with the new Steem source today. Its working fine on my machine.
Im still looking into baking in some performance improvements but for now these work and you should be set for the hardfork next week.
Find here in the 0.12.0 release:
https://github.com/vonkoda/steembuilds/tree/master/release
Direct link:
https://github.com/vonkoda/steembuilds/raw/bab52c1b3ba04bde14e84e19a49b1ada65e9658b/release/0.12.0/0.12.0.zip
remember to start with:
steamd --rpc-endpoint --replay