what a mission (but it worked)
If there is one thing to say about Wiihacks it's this:
"If you follow the guides you will succeed"
To get this to work started with patience. I initially had the 1029 error so I went here Error List - with solutions and tried deleting IOS249 with any deleter, but then it through up another error, this time 2011.
Sure enough from the error list guide, there was a fix. So I followed step 1-3 of this guide.
After doing so I then installed Hermes v4 with this guide.
Following on from that, I followed this guide to install IOS202.
I read all the above, followed the guides and I am pleased to say I can now install GH5 DLC.
Thanks guys for the amazing guides! It now works and I'm very, very happy.