Being a mac user I have always ran into problems but I think I concurred them all! Here is a checklist to hopefully help get this game DL hassle free.
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Go to your [ System preferences > Security & Privacy > Allow apps downloaded from: Anywhere ]
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Start the patcher > right click it in your dock > Options > Show in Finder > Right click "LoLpatcher" > Get info > Check the box to Prevent app nap > Do the same for the patchhelper > CLOSE THE PATCHER
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Go to [ System preferences > Network > Advanced > DNS > Add two DNS Servers: 8.8.8.8 & 8.8.4.4 ]
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Start up League of Legends and begin patching
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Open up your "Activity Monitor"
If download starts to slow down dramatically do the following:
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Turn Peer to Peer sharing on in setting for 30sec - 1 minute, then switch back
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Toggle between NA and Oceania Server
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check to see if your Lol_Kernel is (Not Responding) ---If this is the case, quit the process using the X in the top left--- DO NOT QUIT THE LOL PATCHER EVEN IF ITS (NOT RESPONDING)
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I think it works with your firewall both on and off. If is another setting you can toggle during download to see which way will provide better DL speeds. [ System preferences > Security & Privacy > Firewall ]
Happy Holidays! Hope this works for you.