If you are unable to install .NET 3.5 on Windows 8 or 8.1 and end up with errors like 0x800F0906 and 0x800F081F you will find that errors relate to corrupt or limited access to the source files. In ALL of the times I have tried to get around this, the source has NOT been the issue.
Often you can just install .NET 3.5 by bringing up a CMD window (don’t forget to right click andRUN AS ADMININISTRATOR) and then type either:
Dism /online /enable-feature /featurename:NetFx3 /All /Source:<drive>:\sources\sxs /LimitAccess
or
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All
In my most recent situation I would then error out with 0x800F081F and the logs would show:
2014-09-10 19:07:54, Error DISM DISM Package Manager: PID=5116 TID=4028 Failed finalizing changes. – CDISMPackageManager::Internal_Finalize(hr:0x800f081f)
2014-09-10 19:07:54, Error DISM DISM Package Manager: PID=5116 TID=4028 The source files could not be found; their location must be specified using the /source option to restore the feature. – GetCbsErrorMsg
2014-09-10 19:07:54, Error DISM DISM Package Manager: PID=5116 TID=4028 Failed processing package changes with session options – CDISMPackageManager::ProcessChangesWithOptions(hr:0x800f081f)
2014-09-10 19:07:54, Error DISM DISM Package Manager: PID=5116 TID=4028 Failed ProcessChanges. – CPackageManagerCLIHandler::Private_ProcessFeatureChange(hr:0x800f081f)
2014-0910 19:07:54, Error DISM DISM Package Manager: PID=5116 TID=4028 Failed while processing command enable-feature. – CPackageManagerCLIHandler::ExecuteCmdLine(hr:0x800f081f)
If this is your case, then .NET may have been patched on your machine… but wait, you say, it is not installed so how could it be patched… that is a good question. If you look at your WINDOWS UPDATES > HISTORY, you may see some .NET 3.5 patches that have been installed. If that is the case go to PROGRAMS AND FEATURES > VIEW INSTALLED UPDATES (from the menu on the top left) and find them by KB number. Note that I have found the names of the patches Windows Update History do NOT match what is in INSTALLED UPDATES… go figure.
Specifically I suggest you look for (and uninstall) KB2966826 & KB2966828 . In my most recent case I only found KB2966828 but after I uninstalled it and rebooted (yes, the reboot was necessary) I could install .NEt3.5 on my Win8 PC.
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