Mac OS high Sierra 13 inch (2017). version 10.13.6

You haven't told us which 2017 Mac you have. It is the Mac's hardware model – not the fact that it is running High Sierra – that determines how far you can update.

• You can update a MacBook Air (13-inch, 2017) to Monterey, and no further.
• You can update a MacBook (Retina, 12-inch, 2017), any of the 2017 MacBook Pros, or any of the 2017 iMacs to Ventura, and no further.
• You can update the 2017 iMac Pro to Sonoma. I'm pretty sure you don't have this Mac.
• There were no 2017 Mac minis or Mac Pro desktop computers.

How to download and install macOS - Apple Support

Note: When Apple releases Sequoia later this year, anything older than Ventura will no longer be one of the "most recent three" that get the most support from application vendors.

Possible workarounds for not being able to upgrade...

Mostly you just need a more modern Browser than Safari on Catalina, Mojave, or High Sierra like Firefox or Brave.

https://brave.com/

https://www.mozilla.org/en-US/firefox/83.0/system-requirements/

Details about recent download Brave, for 10.13.6/10.14.6 are here:

<https://github.com/brave/brave-browser/releases/tag/v1.57.64>

Firefox 83.0 System Requirements (mozilla.org)

Opera…Thanks

https://www.opera.com/download/requirements

Opera system requirements | Opera

Thanks to dialabrain…

Firefox 115 is now the current version. runs in High Sierra.

119.0.1 is now the current version and requires 10.15 or later.

https://www.mozilla.org/en-US/firefox/new/

Firefox 45.9.0esr will be the most up to date version with security fixes that will run on OS X 10.6, 10.7 and 10.8.

http://archive.mozilla.org/pub/firefox/releases/45.9.0esr/mac/ 

http://archive.mozilla.org/pub/firefox/releases/45.9.0esr/mac/en-US/

Thanks to WZZZ…

Chromium Legacy, for 10.7-10.14, which runs reasonably well with all my usual extensions on the 10.13.

https://github.com/blueboxd/chromium-legacy

Only issue is no updater, so will have to be on the lookout for new releases to install manually. Can get them here

https://github.com/blueboxd/chromium-legacy/releases

https://x704.net/bbs/viewtopic.php?f=17&t=9744&p=128567#p128567

Thanks to A Brody, Browsers by Mac operating system…

Browsers by Mac operating system - Apple Community

Back up your data, check the application compatibility table, click here, and if your Mac model is recent enough, then on the download link for a newer OS.

Catalina and above won't run 32-bit software and split the functions of iTunes up; if you choose one of them, use Go64 as well.

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