Possible bug/limit in hum remover filter

This is a problem that affects a lot of Nyquist plug-ins (but not all).
Unlike built-in effects, Nyquist effects do not have arbitrary access to the audio data - they can read a track selection once, from the start of the selection to the end of the selection. Some processes, notable those that require analysis before the effect is applied, need to access the data more than once, and the only way that they can do that is to retain the data in RAM. However, because Nyquist is running in a 32-bit environment, the limit to the amount of data that may be addressed in RAM is 2GB. Thus many Nyquist effects break beyond an hour and a bit.

I’m a bit surprised that this problem occurs with a filter plug-in. Where can I find that plug-in?