Improve file check speed, apparently Files.exists is slow

src/main/java/link/infra/packwiz/installer/DownloadTask.java

@@ -124,7 +124,7 @@ class DownloadTask implements IOptionDetails, IExceptionDetails {
 
 		// Don't update files marked with preserve if they already exist on disk
 		if (metadata.preserve) {
-			if (Files.exists(destPath)) {
+			if (destPath.toFile().exists()) {
 				return;
 			}
 		}

src/main/java/link/infra/packwiz/installer/UpdateManager.java

@@ -161,7 +161,7 @@ public class UpdateManager {
 				// if isn't optional, or is optional but optionValue == true
 				if (!entry.getValue().isOptional || entry.getValue().optionValue) {
 					if (entry.getValue().cachedLocation != null) {
-						if (!Files.exists(Paths.get(opts.packFolder, entry.getValue().cachedLocation))) {
+						if (!Paths.get(opts.packFolder, entry.getValue().cachedLocation).toFile().exists()) {
 							invalid = true;
 						}
 					} else {