Need 64bit current Notary Tool for old version Xcode

Targets macOS
1

My dilemma -

Updated to OSX 15 (Sequoia) beta on M1 Mac mini.
Don’t mind messing with betas to test apps but forgot that this machine was the only one that can notarize my apps.
Developer certificate were suddenly showing in App Wrapper as missing private key even though all keys are valid in my key chain. Now some are showing as not trusted and even deleting and replacing them with new downloads doesn’t fix it.
Don’t care too much it’s beta and that’s the risk you take but I still need a way to sign my current apps.

So …

I have an old laptop running Catalina that up until recently notarized fine, in fact I preferred to use it to make installers that work for new and old Macs as you can’t do that with new OS.
However since Apple updated from Altool it doesn’t sign anymore.
Apple suggests updating Xcode version but I can’t go any higher with Catalina.

Their other suggested remedy is copying the Notary Tool from a new version of Xcode into the old Xcode app.
I can’t do that as my only other Mac is ARM64 and I need X64.

Any idea how I can get a copy of the 64 bit Notary Tool?
I’m not suggesting anyone do anything illegal (I don’t know if it is or not) but if you want to send it to me the path is -

/Contents/Developer/usr/bin/notarytool

2

You can download Xcode as zip files on Apple developer website in software section. Expand it, take the notary tool from it.

3

I downloaded XCode 14 and copied the notary tool to my Catalina system.
It looked very promising it signed, packed and started upload and then -

*failed dyld: lazy symbol binding failed: Symbol not found: _swift_getTypeByMangledNameInContextInMetadataState
Referenced from: /Applications/Xcode.app/Contents/Developer/usr/bin/notarytool (which was built for Mac OS X 11.0)
Expected in: /usr/lib/swift/libswiftCore.dylib

dyld: Symbol not found: _swift_getTypeByMangledNameInContextInMetadataState
Referenced from: /Applications/Xcode.app/Contents/Developer/usr/bin/notarytool (which was built for Mac OS X 11.0)
Expected in: /usr/lib/swift/libswiftCore.dylib*

4

Okay I’ve tried everything and it doesn’t seem to be feasible. It’s a common question on other forums and others have hit the same problem. The notary tool depends on components which aren’t found in earlier OS.
So Apples advice here doesn’t appear to be valid, you can’t use a later notary tool to notarise with Xcode 13 or less.