Safari Update 12.2 for MacOS Sierra

Back up your data, check your applications for compatibility, and depending on which Mac model you have, click on High Sierra, Mojave, Catalina, or Big Sur; alternatively, switch to a product such as Firefox. There isn't a Safari 12.2 or other update for Sierra.

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If you upGrade to High Sierra one will get Safari 13.xx

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 Others may not work

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 no 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.