# Need URSim 5.16.0 for compatibility with robot running Polyscope 5.16

**URL:** <https://forum.universal-robots.com/t/need-ursim-5-16-0-for-compatibility-with-robot-running-polyscope-5-16/41544>\
**Category:** General Application Help: How do I?\
**Created:** [October 20, 2025, 3:09pm UTC](https://forum.universal-robots.com/t/need-ursim-5-16-0-for-compatibility-with-robot-running-polyscope-5-16/41544 "2025-10-20T15:09:01Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![maximilian.gussen](https://avatars.discourse-cdn.com/v4/letter/m/58f4c7/32.png) [@maximilian.gussen](https://forum.universal-robots.com/u/maximilian.gussen)\
**Post date:** [October 20, 2025, 3:09pm UTC](https://forum.universal-robots.com/t/need-ursim-5-16-0-for-compatibility-with-robot-running-polyscope-5-16/41544/1 "2025-10-20T15:09:01Z")

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Hi everyone,

I’m currently working with a UR robot that runs **Polyscope 5.16.0**.  
On my PC I have **URSim 5.12.6** (the version included with the standard simulator package) and the newest available download from the UR website seems to be **URSim 5.23**.

Here’s my problem:

- Programs created on the robot (Polyscope 5.16) **cannot be opened in URSim 5.12** , which makes sense because it’s an older version.

- However, if I use **URSim 5.23** , any programs I create there **cannot be loaded back onto the robot** since 5.23 files aren’t backward compatible with 5.16.

So I’m stuck in between versions. 😅

**My questions:**

1. Is there any official or archived download link for **URSim 5.16.0** (or any 5.16.x build)?

2. If not, is there a recommended way to make a `.urp` project from 5.23 compatible with Polyscope 5.16?

I’d really appreciate any advice or a pointer to where I can get the matching URSim 5.16 image

Thanks in advance!

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**Author:** ![eric.feldmann](https://avatars.discourse-cdn.com/v4/letter/e/94ad74/32.png) [@eric.feldmann](https://forum.universal-robots.com/u/eric.feldmann)\
**Post date:** [October 20, 2025, 4:15pm UTC](https://forum.universal-robots.com/t/need-ursim-5-16-0-for-compatibility-with-robot-running-polyscope-5-16/41544/2 "2025-10-20T16:15:28Z")

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Is there a reason not to update the robot to 5.23 or even 5.24 (since that’s the newest)? That’d be the first thing UR would have you do in the event that it needs some kind of service anyway

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**Author:** ![maximilian.gussen](https://avatars.discourse-cdn.com/v4/letter/m/58f4c7/32.png) [@maximilian.gussen](https://forum.universal-robots.com/u/maximilian.gussen)\
**Post date:** [October 29, 2025, 2:55pm UTC](https://forum.universal-robots.com/t/need-ursim-5-16-0-for-compatibility-with-robot-running-polyscope-5-16/41544/3 "2025-10-29T14:55:31Z")

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There was a reason 🙂 But now we have updated everything and its working. Thank you!

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**Author:** ![efn](https://avatars.discourse-cdn.com/v4/letter/e/35a633/32.png) [@efn](https://forum.universal-robots.com/u/efn)\
**Post date:** [October 30, 2025, 5:57am UTC](https://forum.universal-robots.com/t/need-ursim-5-16-0-for-compatibility-with-robot-running-polyscope-5-16/41544/4 "2025-10-30T05:57:18Z")

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FYI, most old updates and offline simulators are available from this link: [Universal Robots - LEGACY DOWNLOAD CENTER](https://www.universal-robots.com/articles/ur/documentation/legacy-download-center/)