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I am on current Visual Studio Version 15.8.4 which contain Xamarin.iOS 11.14.0.13. Today I updated my Visual Studio for Mac and automatically updated Xamarin.iOS to version 12.0.0.15 (based on he Xcode 10 final release) which is not compatible. I get the following error:

Xamarin.iOS versions mismatch

The Xamarin.iOS SDK version installed on Max is not compatible with this version of Visual Studio. Would you like us to install Xamarin.iOS '11.14' for you? This will overwrite any existing Xamarin.iOS installation on your Mac.

When I click 'Install' then the following error occurs:

Error

There were problems installing Xamarin.iOS '11.14'. Please try again and if the problem persists, try installing directly on the Mac and connect again.

On the mac I chose Update channel: Stable. I also tried the other channels withoud success. I am not able to install version 11.14 at all at the moment.

Is my only option to wait until they fix that version mismatch?

Community
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Oliver Christen
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2 Answers2

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Visual Studio Version 15.8.5 fixes this. The release notes contain the following text:

Visual Studio Tools for Xamarin now supports Xcode 10, which allows you to build and debug apps for iOS 12, tvOS 12, and watchOS 5.

Todd
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I am getting the same error after reading this blog post and following the upgrade suggestions. https://blog.xamarin.com/ios-12-and-xcode-10/

But my first read through I missed this little tidbit.

"On Windows, Visual Studio 2017 will prompt for an update as it rolls out."

It appears as if the Visual Studio update might not be available yet. I allowed the prompt to downgrade the SDK and I can now connect again. My problem now is that I can no longer use the iOS Xamarin Simulator on my Windows machine. I get a device not found.

enter image description here

I figure the only way to fix this is to downgrade my Xcode back to 9. A workaround is to simply uncheck the "Remote Simulator to Windows" option in Visual Studio under Xamarin -> iOS Settings. That allows the simulator to launch my app on the Mac. I think I can live with this for now and hope that a new VS update is right around the corner.

Update: I also think it is important to mention that Matthew Clendening in the comments to the original post did provide a link to a preview release of the Visual Studio tools if any was unwilling to wait for an official release.

Update 2: We decided to try the pre-release versions of the Visual Studio tools that Matthew linked above and did verify that Pairing works after installing them. If people are not spooked off by pre-release software then it is a viable option.

Update 3: I spoke too soon. I am able to Pair with my Mac with XCode 10 installed but still cannot get the Simulator to run on my windows machine so I am essentially back to where I was when I down graded Xamarin.iOS SDK to 11.4. I am going to dig more to see if this is an unrelated issue.

Last Update: So, overnight as Todd mentioned Microsoft released 15.8.5 and after upgrading, everything is working normally again. Lesson learned ... don't upgrade ANYTHING until EVERYTHING is ready.

webwires
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    VS for Mac and Windows Xamarin > iOS Settings can specify the Xcode path and working with multiple Xcode installations is [possible](https://medium.com/@hacknicity/working-with-multiple-versions-of-xcode-e331c01aa6bc) – Benl Sep 20 '18 at 20:44