> For the complete documentation index, see [llms.txt](https://docs.devolutions.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.devolutions.net/rdm/knowledge-base/troubleshooting-articles/.net-runtime-optimization-service-issues.md).

# .NET runtime optimization service issues

Some user will have an issue on Windows 7 with Remote Desktop Manager and receive the following error message:

.NET Runtime Optimization Service (clr\_optimization\_v4.0.30319\_64) - 1>Failed to compile: C:\Program Files (x86)\Devolutions\Remote Desktop Manager Free\Embedded32.exe Error code = 0x80131f07

### Solution 1

If possible, update your Windows 7 version. Microsoft 7 SP1 does supportNET 4.8 but the [Extended Security Updates (ESU)](https://docs.microsoft.com/en-us/troubleshoot/windows-client/windows-7-eos-faq/windows-7-extended-security-updates-faq) from Windows end date is January 2023.

### Solution 2

Use the compatibility mode as a workaround.

1. Right click Remote Desktop Manager shortcut.
2. Select ***Properties*** from the context menu.
3. Click the ***Compatibility*** tab.
4. Check ***Run this program in compatibility mode for***.
5. Select the version of Windows in the drop down menu.
6. Click ***OK***.


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