After a few tries, it worked for me:)
I have collected the relevant information so follows a step-by-step if you need to use this thing too:)
Step #01 — Open Arduino 1.8.8 IDE, goes to Preferences > Additional Boards Manager URLs and paste:
http://digistump.com/package_digistump_index.json
Step #02 — Quit and Open the Arduino IDE again, in order to make the modifications active;) Just Fine!
Step #03 — On the IDE, goes to Tools > Boards Manager, choose Type: Contributed, type dig and select:
Digistumb AVR Boards by Digistump
Hack
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