We have confirmation that MyAssistant version 20.3.5 is compatible with Sage 300 Construction and Real Estate version 20.5. See KB 113885 "Is MyAssistant version 20.3.5 compatible with Sage 300 Construction and Real Estate version 20.5?" for details.
Sage Construction & Real Estate
Welcome to the Sage Construction and Real Estate products Support Group on Community Hub! Available 24/7, the Forums are a great place to ask and answer product questions, as well as share tips and tricks with Sage peers, partners, and pros.
Sage 300 CRE Announcements
MyAssistant and compatibility with Sage 300 Construction and Real Estate version 20.5