It happened I’m on Windows and I’m downloading again beta4 iso images, both for 32 and 64 bit.
Now, on the page “Get Haiku!” I read in order to calculate checksums on Win I’m pointed towards hashtab, which seems to be unmaintained now (their website warns it was discontinued in early 2022).
Instead, I would suggest any Windows users not to install anything, as they can call certutil, a command line utility shipping with Windows back since 7 at least.
What I run:
>certutil -hashfile haiku-r1beta4-x86_gcc2h-anyboot.iso SHA256 Hash SHA256 del file haiku-r1beta4-x86_gcc2h-anyboot.iso: c184e609a6c0021f9acd2df9fc111c2e12d01107d01f943fbea66c936b063f88
>certutil -hashfile haiku-r1beta4-x86_64-anyboot.iso SHA256 Hash SHA256 del file haiku-r1beta4-x86_64-anyboot.iso: 6e4b33045a0c36efb2b8fe758ef3550bf87298a0c5a7c2fbdf4b155e19397ac7
and the check is done, without installing anything on the OS.