# CEP version in InDesign 2025

**URL:** <https://forums.creativeclouddeveloper.com/t/cep-version-in-indesign-2025/10206>\
**Category:** InDesign\
**Tags:** uxp\
**Created:** [March 9, 2025, 4:13am UTC](https://forums.creativeclouddeveloper.com/t/cep-version-in-indesign-2025/10206 "2025-03-09T04:13:33Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![saxenark](https://avatars.discourse-cdn.com/v4/letter/s/839c29/32.png) [@saxenark](https://forums.creativeclouddeveloper.com/u/saxenark)\
**Post date:** [March 9, 2025, 4:13am UTC](https://forums.creativeclouddeveloper.com/t/cep-version-in-indesign-2025/10206/1 "2025-03-09T04:13:33Z")

</div>

Hi,

What is the CEP version supported in InDesign 2025?

I have the following which does not work and gives error “Unsupported InDesign Version” with “11.0”. With “12.0” the extension doesn’t even load.

```auto
   <ExecutionEnvironment>
      <HostList>
         <Host Name="IDSN" Version="[20.0,20.9]" />
      </HostList>
      <LocaleList>
         <Locale Code="All" />
      </LocaleList>
      <RequiredRuntimeList>
         <RequiredRuntime Name="CSXS" Version="12.0" />
      </RequiredRuntimeList>
   </ExecutionEnvironment>

```

Even on the official CEP site I can’t find if it supports 11 or 12 for InDesign 2025.

[https://github.com/Adobe-CEP/CEP-Resources/blob/master/CEP\_12.x/Documentation/CEP%2012%20HTML%20Exte…](https://github.com/Adobe-CEP/CEP-Resources/blob/master/CEP_12.x/Documentation/CEP%2012%20HTML%20Extension%20Cookbook.md)

Cross Ref: [https://community.adobe.com/t5/indesign-discussions/cep-version-in-indesign-2025/m-p/15196762](https://community.adobe.com/t5/indesign-discussions/cep-version-in-indesign-2025/m-p/15196762)

Please suggest.  
Thanks

---

<div class="post-metadata">

**Author:** ![sttk3](https://avatars.discourse-cdn.com/v4/letter/s/958977/32.png) [@sttk3](https://forums.creativeclouddeveloper.com/u/sttk3)\
**Post date:** [March 9, 2025, 5:42am UTC](https://forums.creativeclouddeveloper.com/t/cep-version-in-indesign-2025/10206/2 "2025-03-09T05:42:53Z")

</div>

Tried it and 12 did not load and 11 succeeded. manifest.xml looks the same.

```auto
<ExecutionEnvironment>
  <HostList>
    <Host Name="IDSN" Version="[20.0,20.9]" />
  </HostList>

  <LocaleList>
    <Locale Code="All" />
  </LocaleList>

  <RequiredRuntimeList>
    <RequiredRuntime Name="CSXS" Version="11.0" />
  </RequiredRuntimeList>
</ExecutionEnvironment>

```

How did you check the error message?

---

<div class="post-metadata">

**Author:** ![saxenark](https://avatars.discourse-cdn.com/v4/letter/s/839c29/32.png) [@saxenark](https://forums.creativeclouddeveloper.com/u/saxenark)\
**Post date:** [March 10, 2025, 8:22am UTC](https://forums.creativeclouddeveloper.com/t/cep-version-in-indesign-2025/10206/3 "2025-03-10T08:22:12Z")

</div>

Apologies to everyone. The extension works perfectly with Version=“11.0”.

The error mentioned was thrown from one of our internal components loaded by the extension which I failed to recognize.

So, all good for now.

Thanks.