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Open IDE Press Ctrl + Comma Insert following link in additonal board manager URLs near the bottom (one url each line should you have any beforehand)

A more updated "package" with support for more chips including the 644 and 644p along with 1284. it also has the benefits that you can select brownout etc from ide:

HINT: pres the button at the end of the box to open a small editor and insert link there

after that go menu tools >>>> Board >>>> pick board manager at the top... in the next selection box OMC should be at bottom of the list... click install