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Home/ Questions/Q 8877927
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Editorial Team
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Editorial Team
Asked: June 14, 20262026-06-14T19:35:20+00:00 2026-06-14T19:35:20+00:00

I am very new to Sitefinity. Currently I created a website & deployed to

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I am very new to Sitefinity. Currently I created a website & deployed to IIS7 sucessfully.
But I have to migrate a website developed in Sitefinity version 3.7.

And I am having problems in deploying that site to IIS7, I searched & found the issue was in Web.Config, therefore I copied the web.Config from 5.2 project into the 3.7 project. But then I had following Error :

Could not load file or assembly 'Microsoft.IdentityModel, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

Previously (before changing the web.Config) I was having the 500 – Internal server error.


Below is the old Web.Config:enter link description here


Edit :

Actually my problem is that, I have the older project running under .net framework 2.0.
Therefore, I first need to upgrade the older project to 3.7 sp4, but I don’t get the 3.7 sp4 download option anywhere on Sitefinity website.

Can anyone help me to upgrade my old project to 3.7 sp4.

Thanks

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  1. Editorial Team
    Editorial Team
    2026-06-14T19:35:21+00:00Added an answer on June 14, 2026 at 7:35 pm

    First, the Sitefinity v3.7 SP4 download should be available on your account-page, if you’re entitled to that edition ofcourse, by following this link.

    Secondly, you shouldn’t have to mess with upgrading v3.7 onto another .NET version by copying/pasting the web.config from your 5.2 project or exchanging dll’s. Changing the app-pool and a possible rebuild should do the trick.

    You can migrate the running 3.7 project, either through Sitefinity Project manager automatically or following the manual steps provided in the documentation by just extracting the Module3.7_SP4_NET35.zip file into the 3.7 folder and add just the following lines to the 3.7 web.config:

    <system.serviceModel>
      <serviceHostingEnvironment aspNetCompatibilityEnabled="true" />
    </system.serviceModel>
    

    If you could elaborate more on the 500 error you received prior to changing the web.config or email me, maybe we can find out what’s causing it…

    Jochem.

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