I downloaded the beta a couple of days ago and today it told me the version is not supported anymore.  Went to my account, then to https://symless.com/synergy/download/beta/direct?platform=macOS&architecture=x64 which then downloaded Synergy_v2.0.0-beta2_b534-9e1c9d3f.  This was the same file I installed earlier in the week.  Regardless, I installed it, in case the software was updated and someone forgot to bump the version number.  Still getting the attached popup.  Thanks.