Does anyone remember how to port themes from RS1 (Anniversary Update) to RS2 (Creators Update)?

Been looking all over VC for the instructions and if they are here I cannot find them, I have been trying to port Razorsedge AC/DC Rock or Bust theme to RS5, the last copy of the theme I have and can find is from RS1 and the port is not going well, keep getting an error in the .msstyle file.