only downloads for windows are needed

private/downloader.rkt

@@ -9,6 +9,7 @@
          racket/system
          racket/string
          file/unzip
+         define-return
          )
 
 (provide download-soundlibs
@@ -91,7 +92,9 @@
 ;; Provided functions
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
-(define (soundlibs-available?)
+(define/return (soundlibs-available?)
+  (unless (eq? (system-type 'os) 'windows)   ; We only need to download libraries for windows. 
+    (return #t))
   (if (file-exists? version-file)
       (with-handlers ([exn:fail? (λ (e) #f)])
         (let ((v (file->value version-file)))