Hello! I currently have macOS High Sierra Version 10.13.6 on my MacBook Air. I have tried multiple methods to update to MacOs X 10.14.4 without success. Can someone please advise?
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If you are obtaining macOS 10.14.4 updater from Apple's download site, then these cannot be used to perform an upgrade from High Sierra to Mojave 10.14.6. You need to visit How to get old versions of macOS site, using only the Safari browser, confirm that your MacBook Air is hardware compatible with Mojave, and then follow the link to the full Mojave upgrade download in the Mac App Store.
If you are obtaining macOS 10.14.4 updater from Apple's download site, then these cannot be used to perform an upgrade from High Sierra to Mojave 10.14.6. You need to visit How to get old versions of macOS site, using only the Safari browser, confirm that your MacBook Air is hardware compatible with Mojave, and then follow the link to the full Mojave upgrade download in the Mac App Store.
The Age of this computer will Govern what newer version of macOS it will Qualify to install. Use About this Mac from the Apple Icon on Desktop - the required Information will be there.
With the above information in-hand - follow this How to get old versions of macOS and verify what version this computer Qualifies to install. Make sure to use Only Safari to commence the download as Other may not work. If download Mojave - it will probably be version 10.14.6
Make a Time Machine Backup Before attempting. Notation - Mojave is the Last version to support 32 bit applications / extensions and Drivers. Catalina and Big Sur Only support 64 bit and there is not workaround.
Are there any AntiVirus, Disk Cleaner, Optimizers, Defrag, VPNs etc installed which should be removed as per Developers Instructions. They are useless, unneeded, cause havoc and interfere with the normal operation of the OS and may even Corrupt the OS requiring a Reinstallation.
Trying to update to macOS 10.14.4
