AirPort Utility for Mac available for free download. AirPort Utility for iOS available for free download. Radio output power: 20.5 dBm maximum (varies by country). Interoperable with 802.11a, 802.11b, 802.11g, and 802.11n-enabled Mac computers, iOS devices, Apple TV.

• Jun 15, 2009  Airport Utility is a Mac OS X utility that allows users to set up, manage, and configure Apple's lineup of AirPort Wi-Fi base stations such as AirPort Extreme and Time Capsule. What does AirPort Utility do? The AirPort Utility allows users to create wireless networks and share USB-attached devices including a hard drive or printer.
• May 31, 2018 Use AirPort Utilityto set up and manage your 802.11n and 802.11ac AirPort base stations, including AirPort Express, AirPort Extreme, and AirPort Time Capsule. AirPort Utility 6.3.1 resolves an issue where AirPort base stations may not appear in AirPort Utility.

You do not have to do anything special to install 5.6, it installs right alongside the new version after it is updated.
If you have older Airport (pre N), you need 5.6.

Apple has 5.6 for Lion available as a direct download rather than needing any tools to pull it out of a previous package: 'AirPort Utility 5.6 for Mac OS X Lion'
http://support.apple.com/kb/DL1482
I think (but I have not tried it) that this installs an application called 'Airport Utility 5.6' so that it does not conflict with the most up-to-date version you may have installed called just 'Airport Utility'.

I have tried this, and I can confirm that the download link, when installed, gives you an app named 'Airport Utility 5.6', which will not overwrite the v6.0 version, so that you can use both as appropriate.
I can't attach an image here, but when you search for 'Airport Utility' using spotlight, you will be given a choice of both apps to run.

I confirm as well, that version 5.6 is installed besides version 6.0, both versions seem to work fine. And the newest version 6.0 is impossible to uninstall the usual way, a warning messages notifies you that macOS needs it to operate.

Unneeded wok. Both can be installed by the system

The others here are correct. You can install it from Apple’s support site and it will exist side by side with v6.0

I have a network containing older Airport Express 'g' units and newer 'n' units so updated to (both) Airport Utility v5.6 and v6.0. If you cross-check, you'll find, at least on a current model Airport Express ('n' version), that Airport Utility v6.0 provides access to only a subset of the setup/capabilities that Airport Utility v5.6 provides.
I didn't notice this mentioned anywhere, but it's actually quite important. In fact, the update web-pages seem to imply that v5.6 was only for older units that 6.0 didn't handle. In fact, it works for both (at least in the case of Airport Express units). Given some of the things that can't ba accessed/configured via 6.0 (e.g., time server setup, unit location, transmit-strength setting, logs, etc.), it seems that you'll need both.

I'm not trying to hijack this thread, but I thought it wasn't possible to mix 'n' and 'g' units.
I recently got a current-generation Time Capsule, and a friend gave me her older-model Time Capsule, which is also an 'n' unit. I had hoped to use my older b/g 'Snow' Extreme and my older b/g Expresses wirelessly with both 'n' Time Capsules (which will be wired to each other via Ethernet), but I've been told it can't be done. Can you point me to information on how you managed to create a mixed g/n network?
Thanks in advance.

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I think - and I'm not sure, but this is how I did it - is to use two channels, one 5 GHz n, and another g.

a, b, g and n devices can all connect to the same wireless network, but the network will slow to the speed of the weakest link. So if you mix g and n devices, the n devices will get no better than g throughput. Only n devices can use 5 GHz frequency, so if you create a mixed LAN and have a dual band router, it is better to use the 5GHZ frequency for the n devices that can use it.

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Thanks, David. The newest Time Capsule is dual-band, so I'll try to work it out.