Josh - having spent some time on benchmarking this, without going too much into the technical side of it, changing the binary to support these older CPUs would require a change which would negatively impact the performance for all users utilising CPU as their chosen device. I was looking into having a separate build to support older CPUs, but I personally just wasn't happy with the performance in testing on a much faster CPU than the i3-2100, so I think for you as my customer, the performance/experience on your current hardware would be sub-optimal.
Typically when trying to transcribe a very short recording, it should take a couple of seconds, but when compiling for older CPU support, it was taking a noticeably longer time.
I will update the minimum specs for Intel to the Haswell generation (2013). I'm very sorry for the inconvenience caused.