windows qt needs to be in a zip file pass protected well before launch. This is the way it is done now, gives people time to download and do a virus check.

also your diff retarget is an old school method that will no longer work. It will be abused by multipools and left for dead at super high diff , i would change this before launch or else more hassle to change after.

block halving seems very slow the blocks are slow and 200k blocks until halving... anyway i guess that bit is up to you guys but really that diff retarget will not work these days at all.