Try the attached. Remember to unzip it 
Only a quick test in each of the options, but appears to work. Changed a couple of parameters for bump-map and displace as-for Gimp 2.10
The usual guarantees - there are none

Only a quick test in each of the options, but appears to work. Changed a couple of parameters for bump-map and displace as-for Gimp 2.10
The usual guarantees - there are none