Roblox.dmg file won't download on Mac anymore

I am trying to reinstall Roblox, but I cannot get the roblox.dmg file to even start downloading. It worked at one time, but now won't start. At the bottom of the download pop up window, there's backup instructions that say "The Roblox installer should download shortly. If it doesn’t, start the download now.", but the hyperlink provided there is not a valid link to .DMG file.. I've had Roblox working for a long time prior to this, but now I can't get it to install anymore.. I'm on Mac OS High Sierra 10.13.6