Hi kalhalo,
I understand that you are not able to install .NET frame work 4.5.1 and you get an error code “Code 80246010 & Code 800705B9”.
This might have caused due to following reasons:
Third party application conflict
Permission on temp location
Please follow the below suggestions and check if it helps:
Method 1: Disable any third party security program
Please disable or remove any third party security program that is installed on the computer. At times these programs will create a conflict.
Important Note: Antivirus software can help protect your computer against viruses and other security threats. In most cases, you shouldn't disable your antivirus software. If you have to temporarily disable it to install other software, you should re-enable it as soon as you're done. If you're connected to the Internet or a network while your antivirus software is disabled, your computer is vulnerable to attacks.
Method 2: delete temp files
Please refer to the below article to delete temporary files from the computer and check if it helps.
Method 3: Update troubleshoot
Please refer to the article below which will give you general troubleshooting for update related
problems.
Additional information:
You can also try to uninstall the current .NET version from the control panel and install the standalone of 4.5.1
http://www.microsoft.com/en-in/download/details.aspx?id=40779
Hope this information helps. For any further assistance, feel free to contact us and we will be happy to help.