The 1.9 version of MacBook Air SMC Updater for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The program lies within System Tools, more precisely General.
From the developer:
MacBook Air SMC Updater addresses a rare issue on some Apple notebooks where a battery that has accumulated more than 1000 charge cycles may unexpectedly shut down or stop functioning.
You may want to check out more software for Mac, such as MacBook Pro SMC Firmware Update, which might be similar to MacBook Air SMC Updater.