Written by When you try to remove an application, you receive the following error: “Another version of this product is already installed” with the error code 1638. This is a problem with minor/major versions of the installed product. When a GUID of a msi package changes (when an msi is generated for example), the product will detect itself […]
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Invalid product key error when adding Windows Server 2012 R2 or Windows 8.1 KMS key
When you try to add the the KMS key for Windows Server 2012 R2 or Windows 8.1: cscript %windir%\system32\slmgr.vbs /ipk [product key] you receive the following error: 0xC004F050 The Software Licensing Service reported that the product key is invalid The KMS server needs to be updated before the key is recognized. Follow this link, download […]
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