Where to download Windows 11 25H2 iso I can test on my pc

Microsoft hasn’t published a public ISO for Windows 11 25H2 yet—that’s why you only see 24H2 on the official download page. Right now, 25H2 is only available through the Windows Insider Program (typically in the Beta or Dev channels). If you want to test it, you’ll need to join the Insider Program in Settings > Windows Update > Windows Insider Program, and then you can either upgrade directly or create installation media from the Insider ISO page once Microsoft posts it.

As for timing, 25H2 is still pre-release, so you should only install it on a test machine or secondary PC, not your main daily driver. If you just want stability, it’s better to wait until the official rollout later this year.