Unattended access doesn't install on Mac OS 10.6 Snow Leopard

Hi, first time here and hope not to place a silly question.

Since Teamviewer will close servers to older releases, my Mac Minis running Mac OS 10.6 (Snow Leopard) won't be available. Looking for the alternatives I found Zoho Assist running on Mac OS 10.6 and above, but after some attempts on three different machines I had no chance to install the unattended access via the download link I created in the Devices pane. Dmg file is ok, but the installer quits soon after I launch it. I tried to look for an installer to meet my Mac Mini specs with no result.

I'm running an old OS, I know, but at this time Mac Minis can't be upgraded or replaced. Is there any suggestion to fix the above issue? Thank you in advance

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Release Notes: Version 1.91, February 2015
Unattended Access (Beta) is live! Unattended Access, a feature requested by a lot of our customers is live now. Currently, it's in beta. You can add up to 100 computers per Technician subscription. They can also be accessed by your organization members. My Computers list in Zoho Assist home page will always display the online status of your unattended computers. You can rename the computers whenever you wish. Currently, Unattended Access can be configured only for Windows computers. Nevertheless,