(Principia author here.) PSA: Since 1.12 the mods that have DLLs with an empty "File Version" will fail to load and the game will be stuck on "loading part upgrades". Details: the 1.12 change log has the sentence: To do this, it seems that KSP parses the file versions of the DLLs it finds in GameData.  Unfortunately, if the file version is empty (which may be the default depending on details of how the DLLs were built) an exception gets raised during parsing.  Error handling is
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