Currently, every time an ISO is released, the old sha256sum file is replaced. If you save the ISO somewhere, in order to download it again in a later use, checking the hash won't be possible.
Oh no, I forget to set "wishlist" again...
I too request this feature. Sometimes we require old iso's but are unable to check for its authenticity.
Thank you for your bug report! However this bug report was created/provided previous to 01/01/2023 and also has not received any updates since before 01/01/2025. Unfortunately KDE neon no longer provides updates for anything older than noble 24.04 based edition's. Please upgrade to KDE neon noble and if you can reproduce the issue after upgrading to an active version, feel free to re-open this bug report. Thanks for understanding!