Can't install extension

Visual studio 2017 15.9.6
PosTools: PowerShellTools.15.0-4.2.2.vsix

I am tryin to install offline but I get this error:

4/3/2019 10:11:06 AM - System restore is not supported on this system 4/3/2019 10:11:06 AM - Failed to create system restore point: 0x80131524 4/3/2019 10:11:11 AM - Certificate is invalid: PowerShellTools.15.0.vsix 4/3/2019 10:11:11 AM - Cache failed. Retrying download of 'PowerShellTools.VS2017,version=4.2.2'. 4/3/2019 10:11:11 AM - Value cannot be null. Parameter name: uri 4/3/2019 10:11:11 AM - Value cannot be null. Parameter name: uri 4/3/2019 10:11:11 AM - Activity threw exception System.ArgumentNullException: Value cannot be null. Parameter name: uri 4/3/2019 10:11:11 AM - Skipping cache of package 'PowerShellTools.VS2017,version=4.2.2' since installing or downloading it failed 4/3/2019 10:11:11 AM - Skipping cache of package 'Component.PowerShellTools.VS2017,version=4.2.2' since the package or a parent package had a vital failure. 4/3/2019 10:11:36 AM - Install Error : Microsoft.VisualStudio.Setup.PackageFailureException: Package 'PowerShellTools.VS2017' failed to download at Microsoft.VisualStudio.Setup.InstallOperation.Run(CancellationToken token) at Microsoft.VisualStudio.Setup.Engine.RunOperation(InstallOperation installOperation, CancellationToken token, ExecuteAction action, ITelemetryOperation telemetryOperation) at Microsoft.VisualStudio.Setup.Engine.RunCoreOperation(InstallOperation coreOperation, ExecuteAction action, ITelemetryOperation telemetryOperation, CancellationToken token) at Microsoft.VisualStudio.Setup.Engine.Install(Product product, String destination, CancellationToken token) at Microsoft.VisualStudio.ExtensionManager.ExtensionEngineImpl.PerformSetupEngineInstall(InstallableExtensionImpl extension, Boolean installPerMachine, Boolean isPackComponent, IDictionary2 extensionsInstalledSoFar, List1 extensionsUninstalledSoFar, IInstalledExtensionList modifiedInstalledExtensionsList, IProgress1 progress, InstallFlags installFlags, AsyncOperation asyncOp, Version targetedVsVersion, IInstalledExtension& newExtension) at Microsoft.VisualStudio.ExtensionManager.ExtensionEngineImpl.InstallInternal(InstallableExtensionImpl extension, InstallFlags installFlags, IDictionary2 extensionsInstalledSoFar, List1 extensionsUninstalledSoFar, IInstalledExtensionList modifiedInstalledExtensionsList, AsyncOperation asyncOp, IProgress1 progress, Version targetedVsVersion) at Microsoft.VisualStudio.ExtensionManager.ExtensionEngineImpl.BeginInstall(IInstallableExtension installableExtension, InstallFlags installFlags, AsyncOperation asyncOp, Version targetedVsVersion) at Microsoft.VisualStudio.ExtensionManager.ExtensionEngineImpl.InstallWorker(IInstallableExtension extension, InstallFlags installFlags, AsyncOperation asyncOp)

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