Issue with System.IO.Compression

I have a PowerShell v2 script with .Net 4.5 which compresses old files. Like this:

[Reflection.Assembly]::LoadWithPartialName("System.IO.Compression.FileSystem")
...
$files = Get-Childitem ...
...
$zip = [System.IO.Compression.ZipFile]::Open($arcpath + $curname, "Create")
foreach ($onefile in $files) {
  [System.IO.Compression.ZipFileExtensions]::CreateEntryFromFile($zip, $onefile.FullName, $onefile.Name, "Optimal") | out-null
}

It worked fine until I have installed .Net 4.6.1 (which is needed for another project).

Now it throws an error:

The following exception occurred while retrieving member "Open": "Could not load
file or assembly 'System.IO.Compression, Version=4.0.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089' or one of its dependencies.
Reference assemblies should not be loaded for execution.  They can only be loaded
in the Reflection-only loader context. (Exception from HRESULT: 0x80131058)"
At line:1 char:7
+ $zip = <<<<  [System.IO.Compression.ZipFile]::Open('C:\Temp\1.zip', "Create")
    + CategoryInfo          : NotSpecified: (:) [], ExtendedTypeSystemException
    + FullyQualifiedErrorId : CatchFromBaseGetMember

I installed WMF 5.1 to use native ps5 compression functions. But it also throws an error:

Compress-Archive -Path $files -DestinationPath C:\Temp\Script\test.zip -CompressionLevel Optimal

Add-Type : Could not load file or assembly 'System.IO.Compression, Version=4.0.0.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies.
Reference assemblies should not be loaded for execution.  They can only be loaded
in the Reflection-only loader context. (Exception from HRESULT: 0x80131058)
At C:\Windows\system32\WindowsPowerShell\v1.0\Modules\Microsoft.PowerShell.Archive\Microsoft.PowerShell.Archive.psm1:469 char:9
+         Add-Type -AssemblyName System.IO.Compression
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Add-Type], BadImageFormatException
    + FullyQualifiedErrorId : System.BadImageFormatException,Microsoft.PowerShell.Commands.AddTypeCommand

How can I fix it?

Deinstalled NET 4.6.1, installed NET 4.6.2. Issue was fixed.