问题
I had to re-install my PC recently, and I re-installed VS2015 Community. And then I installed Xamarin from www.xamarin.com/download
I get the following notice whenever I open visual studio
Although when I click it nothing happens. It just disappears.
Previously on my old version, I had Xamarin Studio, where i could go in, and check for updates, which would also update Xamarin for VS2015. But for the life of me I cannot find a download for Xamarin Studio anymore, I am assuming it got discontinued since Microsoft takeover in order to force use of Visual Studio?
I have downloaded both Xamarin Installer (which also always shows that the VS 2015 Xamarin plugin is missing). But when it goes to install it, it starts some sort of setup/installer which then disappears and it takes me to the Xamarin developers page and shows successful.
I have also tried installing/forcing an update via the "vstoolsforxamarin.exe" VS2015 installer, but no luck. C#/Xamarin is installed and won't update from there :-(.
I can see the XamarinInstaller installs the following version of Xamarin.VisualStudio:
\Temp\Xamarin\downloads\Xamarin.VisualStudio_4.1.1.1.msi
回答1:
Install which you found MSI build in temp folder I hope this latest version or Two ways to fix solution 1.Better goto your Xamarin site login ur account and download the latest version and install 2. Or goto VS-tools menu- Xamarin - disable checking update
回答2:
For me it worked this way,
1-) Installed .Net 4.6 Framework 2-) Installed Microsoft MSBuild Tools 2015 downloaded from here https://www.microsoft.com/en-us/download/details.aspx?id=48159
Then installer worked .. you can get the installer from here,
download.xamarin.com/XamarinforVisualStudio/Windows/Xamarin.VisualStudio_4.1.1.1.msi
来源：https://stackoverflow.com/questions/38170442/cannot-update-xamarin-for-visual-studio