Core: This software needs to be updated. Contact the developer for more information.

[MariaFL9815]

Problem encountered on https://dotnet.microsoft.com/learn/dotnet/hello-world-tutorial/install
Operating System: macOS

Provide details about the problem you are experiencing. Include your operating system version, exact error message, code sample, and anything else that is relevant.

dotnet-sdk-3.0.101-osx-x64.pkg” can’t be opened because Apple cannot check it for malicious software.

It is not updated to the latest macOS Catalina software update.

[scalablecory]

Can you provide your exact OS version and the commands you're using to install the SDK? Thanks.

CC @dagood @aik-jahoda

[ColCoutts]

Having same issue while trying to download dotnet-sdk-3.0.101-osx-x64.pkg

OS Version: Catalina v. 10.15.1

just following these install guides: https://dotnet.microsoft.com/download/dotnet-core/thank-you/sdk-3.0.101-macos-x64-installer and getting the above error message

[dagood]

There's a workaround and more info posted here: https://github.com/dotnet/core/issues/3685#issuecomment-547411254

Show the file in the Finder and open context menu by right click on the downloaded package. Then select Open and a similar dialog will appear however there will be Open button available. When you open it in this way it will execute the package.

@leecow @jcagme do we currently expect this issue to be popping up? Is it documented in a place people can find? Context: "dotnet-sdk-3.0.101-osx-x64.pkg can’t be opened because Apple cannot check it for malicious software." I see a lot of discussion online for other software installers that need this workaround, but people will naturally ask us when our instructions lead them down this path.

[gastonmuijtjens]

Still having this issue when downloading .NET Core SDK 3.1.100: https://dotnet.microsoft.com/download/dotnet-core/thank-you/sdk-3.1.100-macos-x64-installer

macOS 10.15.1 (19B88)

[aik-jahoda]

@gastonmuijtjens Did you follow https://github.com/dotnet/core/issues/3943#issuecomment-560578020 comment? If it doesn't help, can you share your error message and os version?

[leecow]

This message is occurring due to new security features in Catalina. We have been working with Apple to understand what needs to be done and are working toward a resolution. This will take place over the next few months for 2.1, 3.0 and 3.1. See the 3.1 Known Issues document for more info on installing on Catalina if you get this error.

[andreacassioli]

Still happening here. Seriously, anyone have tried this before releasing such an important package? Catalina has been around for months now....

[aik-jahoda]

I tested it on Catalina and it works fine. You need to follow this comment https://github.com/dotnet/core/issues/3685#issuecomment-547411254 ?

Show the file in the Finder and open context menu by right click on the downloaded package. Then select Open and a similar dialog will appear however there will be Open button available. When you open it in this way it will execute the package.

[andreacassioli]

It works following https://github.com/dotnet/core/blob/master/release-notes/3.1/3.1-known-issues.md#net-core-installation-on-macos-catalina-1015

But it is annoying that such a distribution does not work out of the box.

[sadhakbj]

Facing same issue on MacOS Catalina 10.15.2

“dotnet-sdk-3.1.101-osx-x64.pkg” can’t be opened because Apple cannot check it for malicious software.

[leecow]

We have a note about this in the Known Issues doc and workaround steps. Catalina includes additional security checks for installers which are downloaded from web sites which results in this error. We're on track to have the installers properly notarized by Apple for the February release.

[hontas]

The suggested solution does not work for me as I have no option to open it anyway, but... the following helped and has been my command in shining armour since the upgrade to Catalina:

xattr -d com.apple.quarantine path-to-whatever-catalina-wont-open

I use it all the time.

[DavosMarsh]

thanks @aik-jahoda - right clicking on file and open worked for me anyway on Catalina.