32-bit applications after macOS High Sierra

>we cannot convert it to 64-bits in a reasonable time (say before 1 year).

Not sure what you mean - that announcment was made in June, last year, ten months ago. Now you want another year? If you can't get it done by now, you can't get it done. Note that macOS 10.14 is right around the corner.

If you're not in the store, and not willing to update that application, your only hope is that your legacy users feel the same and stay where they are on macOS.

Good luck.

Does anyone know what “macOS High Sierra will be the last macOS release to support 32-bit apps without compromise” exactly mean?

Not the sort of information you’re looking for [1]. I recommend that you monitor the News and Updates page to learn more about any future announcements; it even has a handy RSS feed.

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Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

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[1] There has been information on:

• How developers can deal with this change, for example, the Xcode 9.3 section of the Xcode Release Notes

• The new-in-10.13.4 warning to users

That’s a good suggestion and I´ll keep an eye on the News and Updates.

eskimo, thanks for your response.