Unable to find type [System.IO.Compression.ZipFile] on running `kvm install 0.1-alpha-build-0421` gives error on windows 7 about aspnetcore

[TomFromThePool]

Getting the same error here.

[rafasoares]

I've run into the same problem, you need to install Powershell 4 from here:
http://www.microsoft.com/en-us/download/details.aspx?id=40855

You'll want Windows6.1-KB2819745-x64-MultiPkg.msu or Windows6.1-KB2819745-x86-MultiPkg.msu depending on your system.

Now the issue I'm having is this one:

> kvm install 0.1-alpha-build-0421
KRE-svr50-x86.0.1-alpha-build-0421 already installed.
Cannot find KRE-svr50-x86.0.1-alpha-build-0421, do you need to run 'kvm install
0.1-alpha-build-0421'?

And kvm list returns nothing...

[rafasoares]

And solving my own issue (if any of you run into it as well):

Go to C:\Users\[USERNAME]\.kre\packages and delete the existing packages.

[glennc]

Just an extra point of information on this. The error you are getting is because of needing a new version PowerShell, as was said.

The reason is that the KVM script uses the type listed, which was added in .NET 4.5. But the version of PowerShell installed by default on Windows 7 and Windows Server 2008 uses an older version of .NET and so doesn't know about the type.

But there are also other restrictions. For the moment Core CLR will not work on Windows 7. If you try to use -svrc50 it will fail.

[glennc]

We've documented minimum PowerShell version. I don't think we will try to re-write the script to not take the dependency.

[rafasoares]

But I think the script should perform a cleanup if it encounters an error. Or at least add a -reinstall or -force flag in case we are trying to install a versions that supposedly is already installed.

[glennc]

Sure, the error handling around that could be better. But that isn't part of this issue. Can you create a new issue about handling already installed versions in the KRuntime repo?

[xplicit]

Please add .NET and powershell version checking into the script. If it said "you have to install powershell v4.0" at the start it would save the time spent to understanding what is reason for "ZipFile not found" issue.

[Eilon]

@xplicit can you log a new issue for that? This particular issue is closed.

[xplicit]

@Eilon added #61