Can I update from Sierra 10.12.6 to High Sierra 10.13?

Yes, but don't use Firefox on the second link, it mess it up...

https://support.apple.com/kb/sp765?locale=en_US

https://itunes.apple.com/app/macos-high-sierra/id1246284741?mt=12

I'm having the same issue when I try to download High Sierra. It says "This copy of the Install macOS High Sierra application is damaged, and can‘t be used to install macOS."

I currently have Sierra and my mac is from 2011 so it looks like this is the only updated OS I can download.

Has anyone found a solution to be able to download High Sierra?

If you get a corrupted message...

Naw, not damaged, it's just that you have an old copy already in Applications, there are 2 cures...

Disconnect from the Internet & set the Date back to 2014, then you can run the Install MacsOS High Sierra App in Applications, so expired Certificates are not expired.

Or... trash the Install MacsOS High Sierra.app in Applications then a new copy more recent version can be downloaded.

If you get a corrupted message...

Naw, not damaged, it's just that you have an old copy already in Applications, there are 2 cures...

Disconnect from the Internet & set the Date back to 2014, then you can run the Install MacsOS High Sierra App in Applications, so expired Certificates are not expired.

Or... trash the Install MacsOS High Sierra.app in Applications then a new copy more recent version can be downloaded.

If you get a corrupted message...

Naw, not damaged, it's just that you have an old copy already in Applications, there are 2 cures...

Disconnect from the Internet & set the Date back to 2014, then you can run the Install MacsOS High Sierra App in Applications, so expired Certificates are not expired.

Or... trash the Install MacsOS High Sierra.app in Applications then a new copy more recent version can be downloaded.

Same problem. I tried the second suggestion. Moved the High Sierra install app to the trash, then EMPTIED the trash and started over. It worked. Unfortunately, I wished I had stuck with Sierra. High Sierra is slow, slow, slow. No obvious improvement over Sierra except that certain websites require it.

Do you have a Time Machine backup to Restore to/from?

https://support.apple.com/guide/mac-help/revert-to-a-previous-macos-version-mh15216/mac

Any luck yet?

When I update on High Sierra 10.13. it says application to download is damage..Any options please. Thanks

Cannot update from Sierra 10.12 to Sierra 10.13. Website says the download on the Apple website is damaged.