Re: How to download Multibit Classic? Or how can I unencrypt .key file without it?

They removed the binaries but you can compile it yourself.

Alternatively, is there a way to unencrypt it without using Multibit Classic?

Thanks.

HCP did a pretty detailed writeup earlier[1], might want to refer to that.

[1] https://bitcointalk.org/index.php?topic=5304446.msg55964982#msg55964982