There will be mandatory update after block 400, with fixed difficulty issue.

Source: https://github.com/versuscoinproject/VersusCoin
Windows wallet: https://github.com/versuscoinproject/VersusCoin/releases/download/v1.0.1.0/VersusCoin-win-1.0.1.0.zip
Linux wallet: https://github.com/versuscoinproject/VersusCoin/releases/download/v1.0.1.0/VersusCoin-Linux-1.0.1.0.zip

Pool operators please update!

After 400 block old wallets will not sync.