Been there, done that..........
You have to uninstall 4.01 first and then install 4.5. Move your .LKS files and any other custom graphics, etc to a "safe" place before uninstalling 4.01.
The new install will go well and give you the new color pallet. Recompile your processes and you're back in buisness.
PS. Go right to 4.5 build 13 and be current.
Good luck, Mark