When I try to edit the minecraft.jar it always gives me an error when I try to launch the client! So I can't play MC with mods! Im on Mac BTW! This happens to all mods not only one!

Part of the error code:

Couldn't download https://s3.amazonaws.com/Minecraft.Download/versions/1.6.2-Forge9.10.0.789/1.6.2-Forge9.10.0.789.jar for job 'Version & Libraries'
java.lang.RuntimeException: Server responded with 403
at net.minecraft.launcher.updater.download.Downloadable.download(Downloadable.java:85)
at net.minecraft.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:102)
at net.minecraft.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:10)
at net.minecraft.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:84)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)

Couldn't download https://s3.amazonaws.com/Minecraft.Download/versions/1.6.2-Forge9.10.0.789/1.6.2-Forge9.10.0.789.jar for job 'Version & Libraries'
java.lang.RuntimeException: Server responded with 403
at net.minecraft.launcher.updater.download.Downloadable.download(Downloadable.java:85)
at net.minecraft.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:102)
at net.minecraft.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:10)
at net.minecraft.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:84)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)

Couldn't download https://s3.amazonaws.com/Minecraft.Download/versions/1.6.2-Forge9.10.0.789/1.6.2-Forge9.10.0.789.jar for job 'Version & Libraries'
java.lang.RuntimeException: Server responded with 403
at net.minecraft.launcher.updater.download.Downloadable.download(Downloadable.java:85)
at net.minecraft.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:102)
at net.minecraft.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:10)
at net.minecraft.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:84)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)

Finished downloading /Users/daniela/Library/Application Support/minecraft/libraries/lzma/lzma/0.0.1/lzma-0.0.1.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /Users/daniela/Library/Application Support/minecraft/libraries/argo/argo/2.25_fixed/argo-2.25_fixed.jar for job 'Version & Libraries': Used own copy as it matched etag
Couldn't download https://s3.amazonaws.com/Minecraft.Download/versions/1.6.2-Forge9.10.0.789/1.6.2-Forge9.10.0.789.jar for job 'Version & Libraries'
java.lang.RuntimeException: Server responded with 403
at net.minecraft.launcher.updater.download.Downloadable.download(Downloadable.java:85)
at net.minecraft.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:102)
at net.minecraft.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:10)
at net.minecraft.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:84)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)

Finished downloading /Users/daniela/Library/Application Support/minecraft/libraries/com/paulscode/soundsystem/20120107/soundsystem-20120107.jar for job 'Version & Libraries': Used own copy as it matched etag
Couldn't download https://s3.amazonaws.com/Minecraft.Download/versions/1.6.2-Forge9.10.0.789/1.6.2-Forge9.10.0.789.jar for job 'Version & Libraries'
java.lang.RuntimeException: Server responded with 403
at net.minecraft.launcher.updater.download.Downloadable.download(Downloadable.java:85)
at net.minecraft.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:102)
at net.minecraft.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:10)
at net.minecraft.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:84)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)

Gave up trying to download https://s3.amazonaws.com/Minecraft.Download/versions/1.6.2-Forge9.10.0.789/1.6.2-Forge9.10.0.789.jar for job 'Version & Libraries'
Job 'Version & Libraries' finished with 1 failure(s)!