Just wondered if anyone else have had this issue.  I can't seem to update the default skin.

Error installing Skin:
DNN-MinimalExtropySkin (01.00.04)Error installing Container:
DNN-MinimalExtropyContainer (01.00.04) at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy) at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy) at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access) at DotNetNuke.Services.Upgrade.Upgrade.InstallPackage(String strFile, String packageType, Boolean writeFeedback) at DotNetNuke.Modules.Admin.Extensions.BatchInstall.InstallPackageItems(String packageType, CheckBoxList list, Label errorLabel, String errorKey)
 

Cheers Jan for getting back so soon.  Yep i just grabbed it from the install package.  I just changed my skin to a different skin to make sure it's not because of it being in use and then tried to upgrade again and got

Doing further checking i can see i have.

In this section you can configure the package information for this Extension.
	Name: The Package Name (eg. CompanyName.Name) DotNetNuke.MinimalExtropy-Skin  Type: The Package Type Skin  Friendly Name: The friendly name for this package MinimalExtropy Skin  Description: Description of the Package

Could it be because of the high lighted names? differences. Also if i remove and re add the skin will this have any issues etc with being the default skin?

Further info this has only flagged up with dnn ver 5.1.1. Previous 5.1.0 didn't show issue

Just as a follow up. Following the suggested fix above i decided to try just removing as mentioned and all went ok..

Regards