diff --git a/LauncherAPI/src/main/java/pro/gravit/launcher/profiles/ClientProfile.java b/LauncherAPI/src/main/java/pro/gravit/launcher/profiles/ClientProfile.java
index b0265d08..36c533ee 100644
--- a/LauncherAPI/src/main/java/pro/gravit/launcher/profiles/ClientProfile.java
+++ b/LauncherAPI/src/main/java/pro/gravit/launcher/profiles/ClientProfile.java
@@ -254,6 +254,12 @@ public void updateOptionalGraph() {
                     file.conflict[i] = getOptionalFile(file.conflictFile[i].name);
                 }
             }
+            if(file.groupFile != null) {
+                file.group = new OptionalFile[file.groupFile.length];
+                for(int i = 0; i < file.groupFile.length; ++i) {
+                    file.group[i] = getOptionalFile(file.groupFile[i].name);
+                }
+            }
         }
     }
 
@@ -369,6 +375,11 @@ public void verify() {
                 if (s == null)
                     throw new IllegalArgumentException(String.format("Found null entry in updateOptional.%s.dependenciesFile", f.name));
             }
+            if(f.groupFile != null)
+                for (OptionalDepend s : f.groupFile) {
+                    if (s == null)
+                        throw new IllegalArgumentException(String.format("Found null entry in updateOptional.%s.groupFile", f.name));
+            }
             if (f.triggersList != null) {
                 for (OptionalTrigger trigger : f.triggersList) {
                     if (trigger == null)
diff --git a/LauncherAPI/src/main/java/pro/gravit/launcher/profiles/optional/OptionalFile.java b/LauncherAPI/src/main/java/pro/gravit/launcher/profiles/optional/OptionalFile.java
index a5ad4f25..bbe85fc9 100644
--- a/LauncherAPI/src/main/java/pro/gravit/launcher/profiles/optional/OptionalFile.java
+++ b/LauncherAPI/src/main/java/pro/gravit/launcher/profiles/optional/OptionalFile.java
@@ -24,10 +24,14 @@ public class OptionalFile {
     @LauncherNetworkAPI
     public OptionalDepend[] conflictFile;
     @LauncherNetworkAPI
+    public OptionalDepend[] groupFile;
+    @LauncherNetworkAPI
     public transient OptionalFile[] dependencies;
     @LauncherNetworkAPI
     public transient OptionalFile[] conflict;
     @LauncherNetworkAPI
+    public transient OptionalFile[] group;
+    @LauncherNetworkAPI
     public int subTreeLevel = 1;
     @LauncherNetworkAPI
     public boolean isPreset;
diff --git a/LauncherAPI/src/main/java/pro/gravit/launcher/profiles/optional/OptionalView.java b/LauncherAPI/src/main/java/pro/gravit/launcher/profiles/optional/OptionalView.java
index 658edd0b..25fdb266 100644
--- a/LauncherAPI/src/main/java/pro/gravit/launcher/profiles/optional/OptionalView.java
+++ b/LauncherAPI/src/main/java/pro/gravit/launcher/profiles/optional/OptionalView.java
@@ -7,7 +7,9 @@
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
+import java.util.Arrays;
 import java.util.function.BiConsumer;
+import java.util.stream.Collectors;
 
 public class OptionalView {
     public Set<OptionalFile> enabled = new HashSet<>();
@@ -25,6 +27,7 @@ public OptionalView(OptionalView view) {
         this.enabled = new HashSet<>(view.enabled);
         this.installInfo = new HashMap<>(view.installInfo);
         this.all = view.all;
+        fixDependencies();
     }
 
     public OptionalView(ClientProfile profile, OptionalView old) {
@@ -40,6 +43,7 @@ public OptionalView(ClientProfile profile, OptionalView old) {
                 disable(newFile, (file, status) -> {});
             }
         }
+        fixDependencies();
     }
 
     @SuppressWarnings("unchecked")
@@ -80,6 +84,33 @@ public Set<OptionalAction> getEnabledActions() {
         return results;
     }
 
+    //Needed if dependency/conflict was added after mod declaring it and clients have their profiles with this mod enabled
+    public void fixDependencies() {
+        Set<OptionalFile> disabled = all.stream().filter(t -> !isEnabled(t)).collect(Collectors.toSet());
+        for (OptionalFile file : disabled) {
+            if (file.group != null && Arrays.stream(file.group).noneMatch(this::isEnabled)) {
+                enable(file.group[0], false, null);
+            }
+        }
+        for (OptionalFile file : enabled) {
+            if (file.dependencies != null) {
+                for (OptionalFile dep : file.dependencies) {
+                    enable(dep, false, null);
+                }
+            }
+            if (file.conflict != null) {
+                for (OptionalFile conflict : file.conflict) {
+                    disable(conflict, null);
+                }
+            }
+            if (file.group != null) {
+                for (OptionalFile member : file.group) {
+                    disable(member, null);
+                }
+            }
+        }
+    }
+
     public Set<OptionalAction> getDisabledActions() {
         Set<OptionalAction> results = new HashSet<>();
         for (OptionalFile e : all) {
@@ -111,6 +142,11 @@ public void enable(OptionalFile file, boolean manual, BiConsumer<OptionalFile, B
                 disable(conflict, callback);
             }
         }
+        if(file.group != null) {
+            for(OptionalFile member : file.group) {
+                disable(member, callback);
+            }
+        }
     }
 
     public void disable(OptionalFile file, BiConsumer<OptionalFile, Boolean> callback) {
@@ -129,6 +165,11 @@ public void disable(OptionalFile file, BiConsumer<OptionalFile, Boolean> callbac
                 }
             }
         }
+        if (file.group != null && file.group.length != 0) {
+            if (Arrays.stream(file.group).noneMatch(this::isEnabled)) {
+                enable(file.group[0], false, callback);
+            }
+        }
     }
 
     private boolean contains(OptionalFile file, OptionalFile[] array) {