# Error on service pack installation

**URL:** <https://forum.novacura.com/t/error-on-service-pack-installation/430>\
**Category:** Flow Classic\
**Tags:** studio-or-server\
**Created:** [April 30, 2023, 8:03pm UTC](https://forum.novacura.com/t/error-on-service-pack-installation/430 "2023-04-30T20:03:33Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![mcummins](https://avatars.discourse-cdn.com/v4/letter/m/7C9FD7/32.png) [@mcummins](https://forum.novacura.com/u/mcummins)\
**Post date:** [April 30, 2023, 8:03pm UTC](https://forum.novacura.com/t/error-on-service-pack-installation/430/1 "2023-04-30T20:03:34Z")

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When trying to install service pack 6.14.12.16 I get the following Error:

Unable to install URL Rewrite module.

Reason: Unable to download Web Platform Installer.

Please download and install it manually.

It then said it had completed the install ok, but I cannot run any Flows from the web client.

I get this error:

#### Unexpected error: Access to the path ‘-eFjlb1PFUq22QlsB\_0B2w’ is denied.

Does anyone know how I manually install the Web Platform?

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**Author:** ![ivstde](https://dub1.discourse-cdn.com/flex013/user_avatar/forum.novacura.com/ivstde/32/146_2.png) [@ivstde](https://forum.novacura.com/u/ivstde)\
**Post date:** [May 2, 2023, 8:12am UTC](https://forum.novacura.com/t/error-on-service-pack-installation/430/2 "2023-05-02T08:12:20Z")

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Hi,

it should be this one [URL Rewrite : The Official Microsoft IIS Site](https://www.iis.net/downloads/microsoft/url-rewrite)

 ![grafik](https://europe1.discourse-cdn.com/flex013/uploads/novacuratalk/original/1X/7f610fbb5f50187fa1fa60813d7bf2e7c625e990.png)

Hope this helps

B R  
Ivan

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<div class="post-metadata">

**Author:** ![mcummins](https://avatars.discourse-cdn.com/v4/letter/m/7C9FD7/32.png) [@mcummins](https://forum.novacura.com/u/mcummins)\
**Post date:** [May 4, 2023, 6:30am UTC](https://forum.novacura.com/t/error-on-service-pack-installation/430/3 "2023-05-04T06:30:01Z")

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Thanks Ivan. I will give it a try.

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<div class="post-metadata">

**Author:** ![mcummins](https://avatars.discourse-cdn.com/v4/letter/m/7C9FD7/32.png) [@mcummins](https://forum.novacura.com/u/mcummins)\
**Post date:** [May 8, 2023, 4:23pm UTC](https://forum.novacura.com/t/error-on-service-pack-installation/430/4 "2023-05-08T16:23:04Z")

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Hi Ivan,  
Thanks, this allowed the installer, but the web client would still not run any flows.  
I managed to get it working by giving the App Pool account read/write access to the WebClient folder and sub-folders.