# Installation problem

**URL:** <https://forum.opentap.io/t/installation-problem/2580>\
**Category:** General\
**Created:** [October 16, 2025, 10:35am UTC](https://forum.opentap.io/t/installation-problem/2580 "2025-10-16T10:35:40Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![luca\_colombo](https://avatars.discourse-cdn.com/v4/letter/l/c0e974/32.png) [@luca\_colombo](https://forum.opentap.io/u/luca_colombo)\
**Post date:** [October 16, 2025, 10:35am UTC](https://forum.opentap.io/t/installation-problem/2580/1 "2025-10-16T10:35:40Z")

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Hello Community,

I’m new and I started intalling OpenTAP on my Win11 PC laptop but I have this error:

# === 2025-10-16 11:12:14 [Information] Install: .NET 9 not found on the system (Source: InstallViewModel) 2025-10-16 11:12:14 [Information] Install: Installing .NET. This can take a while… (Source: InstallViewModel) 2025-10-16 11:12:14 [Information] Install: Downloading .NET… (Source: InstallViewModel) 2025-10-16 11:12:42 [Information] Install: Installing .NET… (Source: InstallViewModel) 2025-10-16 11:12:44 [Error] Install: Failed to find .NET (Source: InstallViewModel)

I installed the .NET9 manually but the error is still there.

Any advice about how to solve it?

Thanks in advance

Luca

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**Author:** ![rolf\_madsen](https://avatars.discourse-cdn.com/v4/letter/r/43a26b/32.png) [@rolf\_madsen](https://forum.opentap.io/u/rolf_madsen)\
**Post date:** [October 16, 2025, 8:04pm UTC](https://forum.opentap.io/t/installation-problem/2580/2 "2025-10-16T20:04:24Z")

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Hi @luca_colombo and thanks for raising the issue.

Actully, we just fixed the issue in the latest installer. If you try downloading the latest installer from, [opentap.io](http://opentap.io), I think you’ll find that it works.

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**Author:** ![luca\_colombo](https://avatars.discourse-cdn.com/v4/letter/l/c0e974/32.png) [@luca\_colombo](https://forum.opentap.io/u/luca_colombo)\
**Post date:** [October 17, 2025, 11:33am UTC](https://forum.opentap.io/t/installation-problem/2580/3 "2025-10-17T11:33:22Z")

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Hello @rolf_madsen , thanks for the update. The installation worked proprerly.

Have a nice day

Luca