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The safest way to get High Sierra is directly from Apple. Third-party sites often host "distros" that may contain malware or unauthorized modifications.

Leave a comment below with your specific Mac model and current OS version for tailored advice.

Providing the to convert an .app file into a bootable ISO.

hdiutil create -ov -format UDRW -volname "macOS High Sierra" -size 5g -fs HFS+ -srcfolder /Applications/Install\ macOS\ High\ Sierra.app ./macoshighsierra.dmg

Before starting your download, it is important to understand which file type fits your specific needs:

If you need an ISO file for virtualization and you have the official App Store installer, you can convert it yourself. This is safer than downloading a random ISO from a forum.

Use Option 1 above to download Install macOS High Sierra.app .