On download, I extracted from the .zip file (I'm on windows) and upon opening it I double-clicked the .exe file which prompted with a "Run or Cancel" screen and I clicked run, nothing happened, so I opened with Admin privileges, and still nothing.
Can you try to run OfflineBay.exe from powershell or Command prompt? It should print out an error if there's something wrong. It doesn't need admin privileges to run.
On download, I extracted from the .zip file (I'm on windows) and upon opening it I double-clicked the .exe file which prompted with a "Run or Cancel" screen and I clicked run, nothing happened, so I opened with Admin privileges, and still nothing.