diff --git a/launcher-package/build.sbt b/launcher-package/build.sbt
index 98c88901a..a387fece7 100755
--- a/launcher-package/build.sbt
+++ b/launcher-package/build.sbt
@@ -117,12 +117,7 @@ val launcherPackage = (project in file(".")).
          val input = connection.getInputStream
          val writer = new java.io.BufferedOutputStream(new java.io.FileOutputStream(file))
          try {
-           val buffer = new Array[Byte](8192)
-           var bytesRead = input.read(buffer)
-           while (bytesRead != -1) {
-             writer.write(buffer, 0, bytesRead)
-             bytesRead = input.read(buffer)
-           }
+           input.transferTo(writer)
          } finally {
            input.close()
            writer.close()
@@ -153,12 +148,7 @@ val launcherPackage = (project in file(".")).
          val input = connection.getInputStream
          val writer = new java.io.BufferedOutputStream(new java.io.FileOutputStream(macosUniversalTar))
          try {
-           val buffer = new Array[Byte](8192)
-           var bytesRead = input.read(buffer)
-           while (bytesRead != -1) {
-             writer.write(buffer, 0, bytesRead)
-             bytesRead = input.read(buffer)
-           }
+           input.transferTo(writer)
          } finally {
            input.close()
            writer.close()
@@ -175,12 +165,7 @@ val launcherPackage = (project in file(".")).
          val input = connection.getInputStream
          val writer = new java.io.BufferedOutputStream(new java.io.FileOutputStream(linuxX86Tar))
          try {
-           val buffer = new Array[Byte](8192)
-           var bytesRead = input.read(buffer)
-           while (bytesRead != -1) {
-             writer.write(buffer, 0, bytesRead)
-             bytesRead = input.read(buffer)
-           }
+           input.transferTo(writer)
          } finally {
            input.close()
            writer.close()
@@ -197,12 +182,7 @@ val launcherPackage = (project in file(".")).
          val input = connection.getInputStream
          val writer = new java.io.BufferedOutputStream(new java.io.FileOutputStream(linuxAarch64Tar))
          try {
-           val buffer = new Array[Byte](8192)
-           var bytesRead = input.read(buffer)
-           while (bytesRead != -1) {
-             writer.write(buffer, 0, bytesRead)
-             bytesRead = input.read(buffer)
-           }
+           input.transferTo(writer)
          } finally {
            input.close()
            writer.close()
@@ -219,12 +199,7 @@ val launcherPackage = (project in file(".")).
          val input = connection.getInputStream
          val writer = new java.io.BufferedOutputStream(new java.io.FileOutputStream(windowsZip))
          try {
-           val buffer = new Array[Byte](8192)
-           var bytesRead = input.read(buffer)
-           while (bytesRead != -1) {
-             writer.write(buffer, 0, bytesRead)
-             bytesRead = input.read(buffer)
-           }
+           input.transferTo(writer)
          } finally {
            input.close()
            writer.close()
@@ -458,12 +433,7 @@ def downloadUrl(uri: URI, out: File): Unit =
        val input = connection.getInputStream
        val writer = new java.io.BufferedOutputStream(new java.io.FileOutputStream(out))
        try {
-         val buffer = new Array[Byte](8192)
-         var bytesRead = input.read(buffer)
-         while (bytesRead != -1) {
-           writer.write(buffer, 0, bytesRead)
-           bytesRead = input.read(buffer)
-         }
+         input.transferTo(writer)
        } finally {
          input.close()
          writer.close()
diff --git a/main/src/main/scala/sbt/internal/InstallSbtn.scala b/main/src/main/scala/sbt/internal/InstallSbtn.scala
index cb1acb627..22c2ad27f 100644
--- a/main/src/main/scala/sbt/internal/InstallSbtn.scala
+++ b/main/src/main/scala/sbt/internal/InstallSbtn.scala
@@ -110,14 +110,7 @@ private[sbt] object InstallSbtn {
     try {
       val os = new FileOutputStream(path.toFile)
       try {
-        val result = new Array[Byte](1024 * 1024)
-        var bytesRead = -1
-        def impl(): Unit = {
-          bytesRead = inputStream.read(result)
-          if (bytesRead > 0) os.write(result, 0, bytesRead)
-        }
-        impl()
-        while bytesRead > 0 do impl()
+        inputStream.transferTo(os)
       } finally os.close()
     } finally inputStream.close()
   private def getShell(term: Terminal): String = {