G'day twhitehouse, you need to boot your mac in 32 bit mode first.

A known issue with the Logitech Harmony 900 is battery swelling. This is when the battery expands in size and stops working properly. If you have a swollen battery it will need to be invalid guide link. MyHarmony Desktop Software is a user-friendly app that allows you to set-up basically any Harmony remote produced after June 2010, while the older Logitech Harmony Remote Software is recommended. FAQs I have an older Harmony remote and need its software. Some of our older remotes, such as Harmony One, 880, 900, 1000, and 1100, use the Logitech Harmony Remote Software v7.x to add devices and get everything set up.

Try rebooting manually while holding down the 3 and 2 keys.

Once you are logged in you can check this status by:

Apple() --> About this Mac --> More info --> Overview -->SystemReport

System Software Overview:

64-bit Kernel and Extensions:

No if it is boot into 32-bit,

Yes if it is booted 64-bit

You then need to go into System Preferences and turn the Firewall off

Logitech Harmony 900 Video

Select Secuirty and Privacy

Push the 'Stop' button.

Now start up your Logitech App and try updating again.

*** After you're done, don't forget to turn the Firewall back on.

Mar 17, 2012 4:12 PM

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IMPORTANT

We have discovered a problem with Harmony Desktop and syncing. This is impacting customers on mac 10.15.4. Please download the latest version of Harmony Desktop by clicking on 'Using Harmony without a hub?' below.

Logitech Harmony 900 Download

NOTE: Ensure that the old version of Harmony Desktop is closed or uninstalled before installing the new version.

Using macOS 10.15 Catalina?

As of macOS 10.15 Catalina, 32-bit software such as MyHarmony and Logitech Harmony Remote legacy software will no longer run and will require an update for it to work. If you’re using a hub-based remote, you will need to use the Harmony app on your iOS or Android device. You can also continue to use MyHarmony on a computer running Windows or macOS 10.14 or lower. If you have a remote that doesn't use a hub, you may download the latest software using the links on this page.

See Harmony and macOS Catalina for the latest information.

Upgrading to macOS 10.15 Catalina?

If you have a remote that doesn't use a hub, you may come back to this page and download the latest software once you have upgraded to Catalina, your operating system and version will be detected by the page and you will be provided with the correct software for your Mac.

Logitech Harmony 900 Software Mac Reviews

See Harmony and macOS Catalina for the latest information.

Use the MyHarmony desktop software or Harmony mobile app* to set up and sign into your account. From there, you can add devices, set up Harmony Activities, and make changes to your configuration. If you have a Harmony hub-based product, use the Harmony mobile app to set up and configure Harmony.

If you're using an older Harmony remote model, such as Harmony One, 880, 900, 1000, or 1100, see: Logitech Remote Software v7.x

*You must have a hub-based product to use the Harmony mobile app.

Logitech Harmony 900 Video

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