We're talking about this Soft Dev Pack, right?
On the Soft Dev Pack page, I only see Method 2 requiring .NET Framework, so I'm assuming you're trying to perform Method 2. (Correct me if I'm wrong, sorry)
The page also says Method 2 is, quote: "broken."
METHOD 2 (Uses a GUI, PC and Mac, claims to have working cell network) broken. please bug @quandaryninja about this
If you're trying Method 2 (once again, I might be wrong about my assumptions, so please tell me if I am), I don't think it will work.
I would tell you to use Method 1, but you were probably using Method 2 for working cell network thing, right? Sorry, guess it's not working right now. Like the quote, suggests, you can go bug @quandaryninja if you'd like
Although if you do want to try with .NET 4.5, here are the steps:
Check your Installed Programs List to make sure it is actually installed (I'm assuming your on Windows OS)
Note: .NET Framework does not show up in the Installed Programs list in Windows 8.1 (I think this applies to Windows 8, too). .NET Framework is installed into the OS. If you're using Windows 8/8.1, .NET Framework should already be installed.
If it isn't listed, download from here (external link) --> http://www.microsoft...ails.aspx?id=21
Run the installer. Does it successfully complete? Any error messages?