diff --git a/src/main/kotlin/ley/anvil/modpacktools/commands/BuildTechnic.kt b/src/main/kotlin/ley/anvil/modpacktools/commands/BuildTechnic.kt
index eca7431..8d6eb71 100644
--- a/src/main/kotlin/ley/anvil/modpacktools/commands/BuildTechnic.kt
+++ b/src/main/kotlin/ley/anvil/modpacktools/commands/BuildTechnic.kt
@@ -1,6 +1,8 @@
 package ley.anvil.modpacktools.commands
 
 import ley.anvil.addonscript.wrapper.FileOrLink
+import ley.anvil.addonscript.wrapper.IInstaller
+import ley.anvil.addonscript.wrapper.IInstaller.create
 import ley.anvil.modpacktools.CONFIG
 import ley.anvil.modpacktools.MPJH
 import ley.anvil.modpacktools.TERMC
@@ -38,7 +40,7 @@ object BuildTechnic : AbstractCommand("BuildTechnic") {
 
         val fileList = mutableListOf<FileOrLink>()
         //Map of File to Installer
-        val toDownload = mutableMapOf<FileToDownload, String>()
+        val toDownload = mutableMapOf<FileToDownload, IInstaller>()
 
         //RELATIONS
         fileList.addAll(
@@ -57,7 +59,7 @@ object BuildTechnic : AbstractCommand("BuildTechnic") {
                 File(download, "modpack.jar"),
                 forge.url
             )
-        ] = "internal.dir:bin"
+        ] = create("internal.dir", listOf("bin"))!!
 
         fileList.forEach {
             when {
@@ -74,7 +76,10 @@ object BuildTechnic : AbstractCommand("BuildTechnic") {
 
         downloadFiles(toDownload.keys.toList()) {
             if(it.downloadedFile != null) {
-                fPrintln("${it.responseCode} ${it.responseMessage} ${it.file.url} ${it.downloadedFile}", TERMC.brightBlue)
+                fPrintln(
+                    "${it.responseCode} ${it.responseMessage} ${it.file.url} ${it.downloadedFile}",
+                    TERMC.brightBlue
+                )
                 //Use map of file to installer to get installer for given file
                 installFile(toDownload[it.file]!!, it.downloadedFile, tmp).printf()
             } else if(it.exception != null) {
diff --git a/src/main/kotlin/ley/anvil/modpacktools/commands/DownloadMods.kt b/src/main/kotlin/ley/anvil/modpacktools/commands/DownloadMods.kt
index e71b54e..3bd35da 100644
--- a/src/main/kotlin/ley/anvil/modpacktools/commands/DownloadMods.kt
+++ b/src/main/kotlin/ley/anvil/modpacktools/commands/DownloadMods.kt
@@ -48,14 +48,12 @@ object DownloadMods : AbstractCommand("DownloadMods") {
             fileList
                 .filter {it.isURL}
                 .filter {
-                    val (installer, dir) = it.installer.split(':')
-
-                    installer == "internal.dir" && (args.getBoolean("all") || dir == "mods")
+                    it.installer.installerID() == "internal.dir" && (args.getBoolean("all") || it.installer.arguments[0] == "mods")
                 }
                 .map {
                     FileToDownload(
                         if(args.getBoolean("all"))
-                            File(args.get<File>("dir"), it.installer.split(':')[1])
+                            File(args.get<File>("dir"), it.installer.arguments[1])
                         else
                             args.get("dir"),
                         it.url,
diff --git a/src/main/kotlin/ley/anvil/modpacktools/util/Util.kt b/src/main/kotlin/ley/anvil/modpacktools/util/Util.kt
index c44ceb9..a5f126b 100644
--- a/src/main/kotlin/ley/anvil/modpacktools/util/Util.kt
+++ b/src/main/kotlin/ley/anvil/modpacktools/util/Util.kt
@@ -169,3 +169,9 @@ fun File.unzip(outputDir: File) {
 fun ArgumentParser.arg(vararg names: String, block: Argument.() -> Unit) {
     addArgument(*names).block()
 }
+
+/**
+ * Gets the base name of the file without the directory.
+ */
+val File.baseName
+    get() = this.toPath().fileName.toString()
diff --git a/src/main/kotlin/ley/anvil/modpacktools/util/addonscript/ASUtil.kt b/src/main/kotlin/ley/anvil/modpacktools/util/addonscript/ASUtil.kt
index 9b228fb..694b102 100644
--- a/src/main/kotlin/ley/anvil/modpacktools/util/addonscript/ASUtil.kt
+++ b/src/main/kotlin/ley/anvil/modpacktools/util/addonscript/ASUtil.kt
@@ -2,7 +2,9 @@ package ley.anvil.modpacktools.util.addonscript
 
 import ley.anvil.addonscript.curse.ManifestJSON
 import ley.anvil.addonscript.wrapper.ASWrapper
+import ley.anvil.addonscript.wrapper.IInstaller
 import ley.anvil.modpacktools.TERMC
+import ley.anvil.modpacktools.util.baseName
 import ley.anvil.modpacktools.util.fPrintln
 import ley.anvil.modpacktools.util.manifest.ManifestLinksPair
 import org.apache.commons.io.FileUtils
@@ -38,9 +40,9 @@ data class InstallFileSuccess(
  * @param file the file to install
  * @param outDir the directory to install the [file] to
  */
-fun installFile(installer: String, file: File, outDir: File): InstallFileSuccess {
-    when {
-        installer == "internal.override" -> {
+fun installFile(installer: IInstaller, file: File, outDir: File): InstallFileSuccess {
+    when(installer.installerID()) {
+        "internal.override" -> {
             when {
                 file.extension == "zip" -> {
                     TODO("unzip to ./.mpt/twitch/overrides")
@@ -56,12 +58,12 @@ fun installFile(installer: String, file: File, outDir: File): InstallFileSuccess
             }
         }
 
-        installer.startsWith("internal.dir") -> {
-            val (_, dir) = installer.split(":")
-            FileUtils.copyFile(file, File(outDir, dir).resolve(file))
+        "internal.dir" -> {
+            val (dir) = installer.arguments
+            FileUtils.copyFile(file, File(outDir, dir).resolve(file.baseName))
         }
 
-        installer.startsWith("internal.zip") -> {
+        "internal.zip" -> {
             TODO()
         }
 
@@ -150,3 +152,10 @@ fun convertAStoManifest(
 
     return ml
 }
+
+fun installFile(installer: String, file: File, outDir: File) =
+    installFile(
+        installer.split(':').let {IInstaller.create(it[0], it.slice(1 until it.size))!!},
+        file,
+        outDir
+    )