How are you trying to build it? Where did you place VaRestPlugin folder? (into Engine? or into your project?) What are the errors? What platform are you building for? What platform are you building on? Are you using VaRest source code from GitHub or VaRest precompiled binaries?
I’ve been using VaRestPlugin since 4.7 and with each minor/major revision of engine, VaRest never caused any problems…