Old ETC Nomad not installing on Mac

Question

I have a Mac and was just trying to download an older version of nomad. 
 After I unzip the file and try to open the Installer Package, I get a popup saying "ETCnomad_Eos_Mac_v2.3.1.9.0.12 2.mpkg&rdquo; cannot be opened because it is from an unidentified developer." and "macOS cannot verify that this app is free from malware." 
 And there is no option for me to click besides "ok" 
 Anyone know what to do??

Matt Pumplin · Answer

Hello, 
 Current and recent MacOS (10.15 and higher) only support down to Eos v2.9.1. That is a hard break in support when Mac stopped supporting 32-bit applications. 
 v2.3.1 was released 9 years ago and isn't the last version of the 2.3 branch, so I would strongly encourage you to upgrade any related equipment to at least v2.3.3, or v2.9.3 for crossover support with Windows XP consoles.