diff --git a/api/logic/minecraft/Library.cpp b/api/logic/minecraft/Library.cpp
index 66ee13e5..ab83eb36 100644
--- a/api/logic/minecraft/Library.cpp
+++ b/api/logic/minecraft/Library.cpp
@@ -45,10 +45,6 @@ void Library::getApplicableFiles(
             native += actualPath(raw_storage);
         }
     }
-    else if (!presenceOnly)
-    {
-        jar += actualPath(raw_storage);
-    }
 }
 
 QList< std::shared_ptr< NetAction > > Library::getDownloads(
@@ -61,7 +57,6 @@ QList< std::shared_ptr< NetAction > > Library::getDownloads(
     QList<NetActionPtr> out;
     bool stale = isAlwaysStale();
     bool instanceLocal = isInstanceLocal();
-    bool launcherLocal = isLocalBuilt();
 
     auto check_instance_local_file = [&](QString storage)
     {
@@ -77,27 +72,12 @@ QList< std::shared_ptr< NetAction > > Library::getDownloads(
         return true;
     };
 
-    auto check_launcher_local_file = [&](QString storage)
-    {
-        QFileInfo localFileInfo("libraries/" + storage);
-        if(!localFileInfo.exists())
-        {
-            failedLocalFiles.append(localFileInfo.filePath());
-            return false;
-        }
-        return true;
-    };
-
     auto add_download = [&](QString storage, QString url, QString sha1)
     {
         if(instanceLocal)
         {
             return check_instance_local_file(storage);
         }
-        else if(launcherLocal)
-        {
-            return check_launcher_local_file(storage);
-        }
         auto entry = cache->resolveEntry("libraries", storage);
         if(stale)
         {
@@ -262,11 +242,6 @@ bool Library::isInstanceLocal() const
     return m_hint == "local";
 }
 
-bool Library::isLocalBuilt() const
-{
-    return localBuild;
-}
-
 bool Library::isAlwaysStale() const
 {
     return m_hint == "always-stale";
diff --git a/api/logic/minecraft/Library.h b/api/logic/minecraft/Library.h
index d79cfb4a..d735aad9 100644
--- a/api/logic/minecraft/Library.h
+++ b/api/logic/minecraft/Library.h
@@ -48,8 +48,6 @@ public:
         newlib->m_rules = base->m_rules;
         newlib->m_mojangDownloads = base->m_mojangDownloads;
         newlib->m_filename = base->m_filename;
-        newlib->presenceOnly = base->presenceOnly;
-        newlib->localBuild = base->localBuild;
         return newlib;
     }
 
@@ -214,12 +212,6 @@ protected: /* data */
     /// true if the library had a rules section (even empty)
     bool applyRules = false;
 
-    // MultiMC-specific: the artifact must be present, but is not part of the classpath
-    bool presenceOnly = false;
-
-    // MultiMC-specific: the artifact must be present, but cannot be downloaded, because it was created by some other mechanism
-    bool localBuild = false;
-
     /// rules associated with the library
     QList<std::shared_ptr<Rule>> m_rules;
 
diff --git a/api/logic/minecraft/OneSixVersionFormat.cpp b/api/logic/minecraft/OneSixVersionFormat.cpp
index 01e98aee..4e1f33e4 100644
--- a/api/logic/minecraft/OneSixVersionFormat.cpp
+++ b/api/logic/minecraft/OneSixVersionFormat.cpp
@@ -21,14 +21,6 @@ LibraryPtr OneSixVersionFormat::libraryFromJson(const QJsonObject &libObj, const
     readString(libObj, "MMC-absoluteUrl", out->m_absoluteURL);
     readString(libObj, "MMC-filename", out->m_filename);
     readString(libObj, "MMC-displayname", out->m_displayname);
-    if (libObj.contains("presenceOnly"))
-    {
-        out->presenceOnly = requireBoolean(libObj, "presenceOnly");
-    }
-    if (libObj.contains("localBuild"))
-    {
-        out->localBuild = requireBoolean(libObj, "localBuild");
-    }
     return out;
 }
 
@@ -43,10 +35,6 @@ QJsonObject OneSixVersionFormat::libraryToJson(Library *library)
         libRoot.insert("MMC-filename", library->m_filename);
     if (library->m_displayname.size())
         libRoot.insert("MMC-displayname", library->m_displayname);
-    if (library->presenceOnly)
-        libRoot.insert("presenceOnly", true);
-    if (library->localBuild)
-        libRoot.insert("localBuild", true);
     return libRoot;
 }