# Ursim problem installing urcap

**URL:** https://forum.universal-robots.com/t/ursim-problem-installing-urcap/6841
**Category:** Technical Questions
**Tags:** bugs
**Created:** [March 31, 2020, 11:40am UTC](https://forum.universal-robots.com/t/ursim-problem-installing-urcap/6841 "2020-03-31T11:40:22Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![florent.monbrun](https://avatars.discourse-cdn.com/v4/letter/f/b3f665/32.png) [@florent.monbrun](https://forum.universal-robots.com/u/florent.monbrun)
#### Post date: [March 31, 2020, 11:40am UTC](https://forum.universal-robots.com/t/ursim-problem-installing-urcap/6841/1 "2020-03-31T11:40:22Z")

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**URSIM CB3 3.12** : …

Hello,

I downloaded the non linux virtual machine CB3 3.12 for windows (run with virtualbox).  
The polyscope interface works correctly but I can not install an urcap (by the way it is for ros driver). The urcap is visible in the robot interface but nothing happen.

In the log prompt there is a message saying :  
13:23:46.988 WARN - URCap does not exist: /home/ur/ursim-current/programs/externalcontrol-1.0.1.urcap

What i do not understand is that the file exists !

Here after a screenshot of my problem:

 ![2020-03-31_132358](https://us1.discourse-cdn.com/flex020/uploads/universal_robots/original/2X/0/015a907703339469b3ee70e736090a2540cf6ea9.jpeg)

Thanks for your help.

Florent

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<div class="post-metadata">

### Author: ![fujikit](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.universal-robots.com/fujikit/32/6042_2.png) [@fujikit](https://forum.universal-robots.com/u/fujikit)
#### Post date: [March 31, 2020, 1:07pm UTC](https://forum.universal-robots.com/t/ursim-problem-installing-urcap/6841/2 "2020-03-31T13:07:15Z")

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Urcap file is zip file.  
When the extension is changed to “zip”, does it have problem to uncompress the zip file?

Or, is there symbolic link “programs” under ursim-current?

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<div class="post-metadata">

### Author: ![florent.monbrun](https://avatars.discourse-cdn.com/v4/letter/f/b3f665/32.png) [@florent.monbrun](https://forum.universal-robots.com/u/florent.monbrun)
#### Post date: [March 31, 2020, 5:19pm UTC](https://forum.universal-robots.com/t/ursim-problem-installing-urcap/6841/3 "2020-03-31T17:19:57Z")

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I changed the extension “.urcap” in “.zip”.  
And I didn’t manage to decompress it… I tried to download it again and again…and always the same problem.

The urcap is stored on github. I use the browser command “save link as …” and it was the problem.

This does not work:  
 ![2020-03-31_175408](https://us1.discourse-cdn.com/flex020/uploads/universal_robots/original/2X/5/52bb9c5ece403e7e7c245a82304decfa382887f5.jpeg)

So I clicked on the file and use the “Download” button

 ![2020-03-31_175426](https://us1.discourse-cdn.com/flex020/uploads/universal_robots/original/2X/c/c32d59d07040f05f875a0c61f487f05bcf8bf7a2.jpeg)

And it worked !  
Thanks for the advice.