1.66 now available https://surge-synthesizer.github.io
Note: The seems to be a bug in the VST2 macos version of Surge, which can really messup your project. This happens only if you load surge without bridging. Surge can popup on behalf of any other VST effect (!!), and then messes up your project data, since a VSTi does not belong into a DSP slot.
So only use it with plugin bridging. A pity that the bridge is performing so horrible on macos.