Dynamic Load Assemblies in T4 Generator

I'm trying to dynamically load an assembly into my T4 Generator. I've written a class which will locate the assembly in the packages folder:

public static class DynamicModuleLoader
{
    public const string VERSION_GROUP_IDENTIFIER = "version";
    public const string DEFAULT_PACKAGE_LOCATION = "lib\\net45";
    public static void LoadLatestFromNugetPackages(string packageRootDir, string[] assemblyNames /*, bool usePreRelease = false*/)
    {
        foreach (var assemblyName in assemblyNames)
        {
            //var internalPattern = usePreRelease ? @"[\d]+[.\w-]*" : @"[\d.]+\\";
            var internalPattern = @"[\d]+[.\w-]*";
            //We need this regex to filter out other assemblies with similar names, as well as to parse versions
            var regexMatchPattern = $@"(?i){assemblyName}\.(?<{VERSION_GROUP_IDENTIFIER}>({internalPattern}))";
            var regex = new Regex(regexMatchPattern, RegexOptions.Compiled);
            var subDirectories = Directory.GetDirectories(packageRootDir, $"{assemblyName}.*")
                .Where(subDir => regex.IsMatch(subDir));

            var targetDir = subDirectories
                .OrderByDescending(subDir => regex.Match(subDir).Groups[VERSION_GROUP_IDENTIFIER].Value)
                .FirstOrDefault();

            var assemblyFullPath = $"{Path.Combine(targetDir, DEFAULT_PACKAGE_LOCATION)}/{assemblyName}.dll";
            Assembly.Load(assemblyFullPath);

        }
    }
}

In my TT file I then attempt to load the dll dynamially.

<#@ assembly name="System.Core" #>
<#@ assembly name="System.Xml" #>
<#@ import Namespace="System.Linq" #>
<#@ import Namespace="System.Collections.Generic" #>
<#@ import Namespace="System.IO" #>

<# DynamicModuleLoader.LoadLatestFromNugetPackages("$(SolutionDir)\\packages", new [] {"Services.Data" }); #>

<#@ import Namespace="Services.Data.Contracts" #>
<#@ import Namespace="Services.Data.Shared.Keys" #>
<#@ import Namespace="Services.Data.Enums" #>

I verified I am providing the correct path the to assembly yet I still receive an error:

Compiling transformation: The type or namespace name 'Enums' does not exist in the namespace 'Services.Data' (are you missing an assembly reference?) Apps.API.ServiceContracts C:\source\server\Apps.API.ServiceContracts\Data\Models.tt 27