Exercise 2: Why Republishing the Same Version Fails — Possible Solution
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WHY IT FAILS
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Per this chapter, the PowerShell Gallery treats every published version of a module as permanent and immutable once it's live - a specific ModuleVersion, once published, can never be republished or overwritten with different content. Running Publish-Module again with the manifest's ModuleVersion left unchanged is, from the Gallery's own point of view, an attempt to republish an already-existing, already-locked version - which the Gallery rejects, even if the actual code changes being published are genuinely tiny.

WHAT NEEDS TO CHANGE FIRST
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Per this chapter, the ModuleVersion in the manifest has to be bumped to a new, not-yet-published value before Publish-Module can succeed - using Update-ModuleManifest -Path .\MyTools\MyTools.psd1 -ModuleVersion "1.0.1" (or whatever the next appropriate semantic version is) before running Publish-Module again.

WHY THIS WORKS AS AN ANSWER
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It correctly explains that the Gallery treats published versions as immutable rather than allowing overwrites, and correctly identifies Update-ModuleManifest with a bumped ModuleVersion as the required step before a second publish can succeed.