Didn't work for me either. The same error message like before.
But I made some patched two, both worked for me so I think uploading them here to see if they work for everyone else is a good idea:

.nmp: https://nsmbhd.net/file/HXH5xmNiUGg4UBvy/newish%20u.nmp

.xdelta: https://nsmbhd.net/file/3wocGKszMxFNv1FO/nweish%20u.xdelta
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previously (un)known as BooChewbaca

Thanks BooChewbaca! I hope I can get a proper patch in the next update for New-ISH, which might actually be a bit. NSMBe quit on my windows 10 PC, and I couldn't get it to launch. So I moved everything to my windows vista laptop (surprisingly works x10 better!!) And I am working on here now. As far as other stuff, still using windows 10.
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Discord Server 1 - Discord Server 2 - Youtube Channel

No problem. You can edit your main post and put these links in there if you want. They were uploaded onto this site.

Do you know how to create those nmp patches?

And gl with that pc
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previously (un)known as BooChewbaca

You do it with NSMBe I believe. Anyone, correct me if I am wrong. And thanks! This vista is beat up!
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Discord Server 1 - Discord Server 2 - Youtube Channel

Yep, you open your edited Rom (newish in this case). In the Tab Tools/Options you can press "Export Patch". After selecting a clean rom you will be able to use this patch.

But as far as I know, ASM Hacking and some other things don't work with these patches. If you used NSMBe only to hack your rom, this Patch format should be fine though. (@everyone who knows more about this can correct me if im wrong)
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previously (un)known as BooChewbaca

That's exactly what I did! I only used NSMBe for level and graphics, Xdelta for making it a patch, and Desmume for testing!
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Discord Server 1 - Discord Server 2 - Youtube Channel

Well, i've completed the first world and it's nice. I really like the castle level! But there are some camera issues on second and third level.
And some other observations:


Eh, this whomp it's kinda out of place...


I got stuck here...

Well, i'm enjoying the hack, good job!
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Look at my currently project:

first off, I could NOT for the life of me fix those camera issues. and in screenshot #2, that's actually the secret exit! you just have to swim high enough in time to reach the exit there.
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Discord Server 1 - Discord Server 2 - Youtube Channel

Ok ;-)
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Look at my currently project:

ROM download link has been nuked. FAQ clearly states that hacks should be distributed via patches.

Also you don't have to use a dodgy file host then and can simply use the board's uploader.


Edit: Also why did you create an entire thread just to show that it's released. This clearly isn't a new hacl, is it? Please put the download in the main thread.
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GitHub - Kuribo64 - YouTube