I was in a similar problem, I too have a MBP. In the end I just installed it via VMware. The reason you can get wireless is because the VM detects it as an 'ethernet' connection. Ive just bought a recommended wifi adapter off eBay for not that much.
I know this doesn't really help with installing it, but I thought id add my two cents to see if it is a route you could go down. Saved me a massive headache