I have written a module to migrate v1.4 and v2.04 evo websites to v3.
This programs transfers the current manager user, attributes and permissions to the web user table prior to installing v3.
v3 installation will move the tables to the new user table names.
Backup your files and database prior to running the module.
You can find the program in extras or check github for the latest release. https://github.com/BBloke/evo-migrate