Could it be that you have not loaded the snapin containing the cmdlet? If so try this:

# Load the EPiServer Common snapin if required
$snapIn = Get-PSSnapin -Name EPiServer.Install.Common.1 -ErrorAction SilentlyContinue
if ($snapIn -eq $null)
{
Add-PSSnapin EPiServer.Install.Common.1
}

Unfortunately not. :)

Here is the output of a new Powershell session:

PS D:\> Add-PSSnapin EPiServer.Install.Common.1
PS D:\> Add-PSSnapin EPiServer.Install.CMS.6.1.379.0
PS D:\> Get-EPiVersion -MapPath "D:\Websites\Site"
Get-EPiVersion : Object reference not set to an instance of an object.
At line:1 char:15
+ Get-EPiVersion <<<< -MapPath "D:\Websites\Site"
+ CategoryInfo : NotSpecified: (:) [Get-EPiVersion], NullReferenceException
+ FullyQualifiedErrorId : System.NullReferenceException,EPiServer.Install.Common.Cmdlets.GetVersionCmdlet

I get the same results both on my local development machine, and the production servers on EverWeb.

Ok, I just looked at the sourcecode for the cmdLet and it expects the foldername to be in "version" format, so you should be able to call it something like:

Get-EPiVersion -MapPath "C:\Program Files (x86)\EPiServer\CMS\6.1.379.0"

Doh! I din't even consider using that directory as the directory for the commandlet... Thank you!!

Now, the question is - where can I find the Upgrade-EPiRemapDDSTypes commandlet?

That should be in the EPiServer.Framework snapin

$snapIn = Get-PSSnapin -Name EPiServer.Framework.Install.6.2.267.1 -ErrorAction SilentlyContinue
if ($snapIn -eq $null)
{
Add-PSSnapin EPiServer.Framework.Install.6.2.267.1
}

Hmm... Which DLL do I need to run InstallUtil on to be able to add that snap-in?

That would be the not so famous EPiServer.Framework.Install.dll

That was my guess, but I can't find that file on my system. It IS, however, installed in the GAC, but Powershell doesn't seem to find it.

I tried downloading the installation for EPiServer CMS 6 R2 and extracted the contents of EPiServer.Framework.msi, and there I found EPiServer.Framework.Install, which I renamed to EPiServer.Framework.Install.dll. However, when trying to install this dll, InstallUtil says it doesn't have any public installers.

Perhaps a better solution for me would be to take code for EPiServer.Framework.Install.Upgrade.RemapDDSType and add that to my project and run it from there instead? For unknown reasons, I need to remap EPiServer.Core,.PageObject in the DDS.

Patrick,

Where you able to work around this? 

Being as I were unable to remap with PowerShell, I added a call to the method below in my Global.asax.cs Application_Start(). This only does the remapping thought - not any property-renaming:

        private void ReMapType(string _type)
        {
            Type type = TypeResolver.GetType(_type);
            if (type != null)
            {
                string storeNameForType = DynamicDataStoreFactory.Instance.GetStoreNameForType(type);
                if (!string.IsNullOrEmpty(storeNameForType))
                {
                    StoreDefinition definition = StoreDefinition.Get(storeNameForType);
                    if (definition != null)
                    {
                        definition.Remap(type);
                        definition.CommitChanges();
                    }
                }
            }
        }

You have to reference EPiServer.Data.dll as well.

That's kind of what I did as well, but I put it in an IInitializableModule.

I also added this:

foreach (var storeDefinition in StoreDefinition.GetAll())
{
	foreach (var propertyMap in storeDefinition.AllMappings)
	{
		storeDefinition.Remap(propertyMap.PropertyType);
	}

	storeDefinition.CommitChanges();
}