Better implementation of download process

[bernardodsanderson]

Need a better implementation of the download process so the user can see the progress of the download.

[ninpnin]

The OS also gives me a "program not responding" prompt while downloading.

[ryonakano]

@ninpnin Yeah it seems currently the download process is done in a "sync" process so it appears to be freezes, while it's actually working in the background.