diff --git a/fclauncher/InstanceManager.go b/fclauncher/InstanceManager.go
index 305eb13..2c79b15 100644
--- a/fclauncher/InstanceManager.go
+++ b/fclauncher/InstanceManager.go
@@ -77,7 +77,9 @@ func (i *InstanceManager)checkJavaVersion(instance Instance){
 	tokens := []int{0, 0, 0}
 	tokens[0], _ = strconv.Atoi(tokensStr[0])
 	tokens[1], _ = strconv.Atoi(tokensStr[1])
-	tokens[2], _ = strconv.Atoi(tokensStr[2])
+	if len(tokensStr) > 2 {
+		tokens[2], _ = strconv.Atoi(tokensStr[2])
+	}
 	javaVer := 8
 	if tokens[1] == 17 {
 		javaVer = 17
diff --git a/fclauncher/Java.go b/fclauncher/Java.go
index 50a1c5e..fa918aa 100644
--- a/fclauncher/Java.go
+++ b/fclauncher/Java.go
@@ -59,7 +59,7 @@ func (j *JavaManager)InstallJavaVer(version int) {
 			if err != nil {
 				return
 			}
-			target := filepath.Join(path, strings.SplitN(entry.Name, string(os.PathSeparator), 2)[1])
+			target := filepath.Join(path, strings.SplitN(entry.Name, "/", 2)[1])
 			if !entry.IsDir() {
 				rc, err := entry.Open()
 				if err != nil {