Download of Mac Wi-Fi Update 1 was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The actual developer of this free Mac application is Apple, Inc. The program lies within System Tools, more precisely General.
From the developer:
The Mac Wi-Fi Update improves compatibility when using the 5GHz band in Wi-Fi.
Boot ROM or SMC Version Information: To confirm the update has been applied, the CFBundleVersion string of the AirPortBrcm4311.kext will need to be checked.
New driver delivered in update: AirPortBrcm4331.kext CFBundleVersion = 612.20.15
/System/Library/Extensions/IO80211Family.kext/Contents/PlugIns/AirPortBrcm4331.kext/Contents/Info.plist
You may want to check out more software for Mac, such as WiFi Scanner, AirGrab WiFi Radar or Easy WiFi, which might be similar to Mac Wi-Fi Update.
Network Tools
Network Tools