The 'bitmap not found' error is generally caused by moving the dll file after installation, or by having multiple copies of those (z3ta+.dll, z3ta+_fx.dll, z3ta+_fx2.dll) in different folders.
My suggestion would be to 1) Uninstall, 2) search and delete every z3ta+*.dll you can find in your system, 3) Install and point the installer to your folder, 4) Do *not* make copies of the dll file, or move it to other folders. Run the installer again instead.