Microsoft typically only displays the latest version (currently 22H2) on its official download page. To get version 1809 specifically, you can use these methods: Download Windows 10 Disc Image (ISO File) - Microsoft
Support for Windows 10, 1809 extended till November 10, 2020 windows 10 pro version 1809 64bit iso download top
If you still decide to proceed, use the method outlined above: Rufus + Fido to fetch a clean ISO from Microsoft. Verify the SHA-1 hash. Install offline. Block feature updates. And never expose it to the public internet. 1809 extended till November 10
Obtaining the can be challenging because Microsoft has officially transitioned to newer versions like 22H2. Version 1809, known as the October 2018 Update, reached its end of support for consumer editions in November 2020. known as the October 2018 Update