When I try to install, it prompts me to install 'Silverlight 5 Developer Runtime' first. I have already installed 'Silverlight 5 Runtime' (Not developer) and Silverlight 5 SDK on the server. So I am searching for Silverlight 5 Developer Runtime, and I could not find any link to download it on Microsoft Web Site. Uninstall Microsoft Silverlight. Microsoft Silverlight does not work as expected. Attempts to restart the computer and try to upgrade, install or uninstall Microsoft Silverlight again end in the same results. This issue can occur if an existing installation or uninstall has become corrupt. To automatically uninstall Microsoft Silverlight, click the button in the 'Fix it for me' section.
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- Microsoft Silverlight For Mac
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Symptoms
When working with Microsoft Silverlight you may encounter the following scenarios:
Microsoft Silverlight Plugin For Mac
Install Microsoft Silverlight
Upgrade to another version of Microsoft Silverlight
Uninstall Microsoft Silverlight
Microsoft Silverlight does not work as expected

Attempts to restart the computer and try to upgrade, install or uninstall Microsoft Silverlight again end in the same results.
Cause
This issue can occur if an existing installation or uninstall has become corrupt.
Resolution
To automatically uninstall Microsoft Silverlight, click the button in the 'Fix it for me' section. If you would rather verify and update these keys yourself, go to the 'Let me fix it myself' section.
Fix it for me
Note This wizard may be in English only. However, the automatic fix also works for other language versions of Windows.
Note If you are not currently using the computer that is experiencing this problem, you can save the automatic fix to a flash drive or to a CD, and then you can run it later on the computer in question.
When the Fix it solution has completed, click the link below to install the latest version of Microsoft Silverlight:

http://www.microsoft.com/getsilverlight/get-started/install/default.aspx
Let me fix it myself
To resolve this issue yourself, follow these steps:
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Microsoft Silverlight For Mac
Click Start and type Notepad in the Search box
Double-click on Notepad from the list of results above
Copy and then paste the following text into Notepad.
Click File and Save As and type CleanSilverlight.cmd
In the Save astype box, click All Files (*.*)
In the Save in box, click Desktop, and then click Save
On the File menu, click Exit
Right-click the CleanSilverlight.cmd file on your desktop and click Run as administrator
When the uninstall completes, right-click the CleanSilverlight.cmd file on your desktop and click Run as administrator a second time
Once the uninstall has completed, click the link below to install the latest version of Microsoft Silverlight
http://www.microsoft.com/getsilverlight/get-started/install/default.aspxDelete the CleanSilverlight.cmd file from your desktop.
More Information
Microsoft Silverlight Plugin
Microsoft Community
Have other questions? To obtain free support, check out our Microsoft Community. There, you can search for answers or ask other users specific questions. Click the following link to visit the Microsoft Community Forums: http://answers.microsoft.com
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