Trying to wire custom task to artifact, but "Cannot convert the provided notation"

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You will have to explicitly tell Gradle the file to use here. Unfortunately you can only pass a Task instance when that task extends from AbstractArchiveTask. You could simply change your build script like so. This will also instruct Gradle that to publish this artifact it must execute the buildWindowsInstaller task.

artifacts {
    archives(buildWindowsInstaller.target) {
        builtBy buildWindowsInstaller
    }
}