Most Wii U developers started like this, so you're not alone. "Gary's homebrew stuff" Discord server is btw a good place to get started in case you want to do Wii U programming as all Wii U homebrew and CFW developers are there, helping each...
The crashes are probably just a symptom of our new network resetting codes which kick in when such a libcurl error happens. So debugging this crash has low priority.
What's really needed is to debugg this 43 error as it's clearly a wrong error...
Hey, I was having the same issue. Restarting my internet connection seemed to help. But buying an ethernet adapter fixed the issue altogether. No more libcurl43 error and no more crashes.
I know you probably have this issue fixed already but...