you can still use that one, extract this
https://mega.nz/#!SslljJIZ!Q3oxC-jIhUAPn97tEbhC9ClblewLYB2Pr4HerrXN7Ck
and put the files in the root of WIT, they are a simple iso builder and extractor bat, they are set up to find a wii game called game.iso or a folder called output, if you have your wii iso base, put all the files from it into a folder called output, change the main dol to fix94's wiiware booter dol and make a text file including the 4 digit title for your wiiware and put that in the files folder, pack it to iso and I believe you can still use the script for the rest.