> For the complete documentation index, see [llms.txt](https://docs.settlers-united.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.settlers-united.com/settlers-united-en/troubleshooting/known-bugs.md). # Known Bugs ## **HD patch is not up to date / warning message of the ModApi appears when starting Settlers IV.** **Cause:** Error during patching, error in previous download, too little hard disk space, virus scanner or other computer problems. \ **Suggested solution**: The folders: ".settlers-united" and "Plugins" should be deleted in the main directory of Settlers IV. Then restart the computer, set any virus scanners and download the HD patch again by starting a new game. The installation can take more than 10 minutes in exceptional cases. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.settlers-united.com/settlers-united-en/troubleshooting/known-bugs.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.