Sometimes Windows Update download or installation fails with an error code. A lot of update error codes are using the 0x8024xxxx (for instance 0x8024001B, stands for WU_E_SELFUPDATE_IN_PROGRESS). I've covered this topic within my blog post Windows: How to decode update 0x8024…. errors. Recently I stumbled upon Microsoft's support document 938205 Windows Update error code list, where a lot of 0x8024xxxx error codes (unfortunately not all) are documented.