Important update 1:
very very important backup the
wallet.dat and
backups file(the file in /Roaming/masternodecoin/** )
if you do not backup the wallet.dat and backups file ,you will loss all MTNC
2: delete the whole blockchain data and peer.dat and others file and MTNC client file
3: down load the new client MTNC V4.0.0.0 version as below link (windows) ,linux and mac version you should complie yourself
if you dont want to wait for sync ,you can download blockchain data as below (2018 07 28) ，you should download
MTNC Blockchain data 20180728.part01.rar ~ MTNC Blockchain data 20180728.part13.rar
4: open the new client MTNC V4.0.0.0 ,waiting for 10 min until client rescaning over , then close the client
5: put your wallet.dat to the file (the file in /Roaming/masternodecoin/** )
6: then open the client again
7: set up masternode follow the guide (the link
https://docs.google.com/document/d/11WnHDlVmNCTZDnrn8yQYXE21PRBn8h6A5bQiaVpn6Ts/edit?usp=sharing)
MTNC Windows client V4.0.0.0 MTNC Blockchain data source 2018 07 28 I have downloaded the new blockchain data, I already had MTNC V4.0.0 so I didn't reinstall it, however nothing moves now, blockchain is not downloading the missing blocks.
EDIT: It has finally synchronized but now tens of thousands of MTNC are missing, over six months worth of stakes, basically all the stakes I have ever got through my masternodes and by normal staking - even though the transactions are still market in the history.