Fix

pom.xml

@@ -92,5 +92,10 @@
             <artifactId>commons-lang</artifactId>
             <version>2.6</version>
         </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>2.11.0</version>
+        </dependency>
     </dependencies>
 </project>

src/main/java/de/chaos/swlnmngr/route/routes/LinkRoute.java

@@ -2,6 +2,7 @@ package de.chaos.swlnmngr.route.routes;
 
 import de.chaos.swlnmngr.Main;
 import de.chaos.swlnmngr.config.Config;
+import org.apache.commons.io.FileUtils;
 
 import java.io.File;
 import java.io.IOException;
@@ -36,7 +37,13 @@ public class LinkRoute implements Route {
         }
         File link = new File(projectDir, "lib");
         try {
-            Files.deleteIfExists(link.toPath());
+            if(link.exists()) {
+                if(link.isDirectory()) {
+                    FileUtils.deleteDirectory(link);
+                } else {
+                    FileUtils.delete(link);
+                }
+            }
             Main.getLogger().debug(libsFile);
             Main.getLogger().debug(link);
             Path linkPath = Files.createSymbolicLink(link.toPath(), libsFile.toPath());