Help with NCF 3.5

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I just got an HD2 through T-Mobile. I tried to install NCF 3.5, but it says I have a more recent version and I have to uninstall it to put 3.5 on. I searched through the forums here and tried what answers I could. I went to Modaco and downloaded their 2 cabs, I could install the first but not the 3.5 itself. This is from (modaco-how to install net compact framework without having to upgrade your rom). I looked to change the dll file to txt but couldn't find the dll described in the forum on here. Can anyone tell me what I need to do?
Thanks for the help

3.7 version

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Not sure but I think tmous hd2 has net 3.7