Body replication such as 'downloading into a computer' won't transfer your consciousness, so in effect you will die and a copy will continue. Same as what happens during Star Trek teleportation.
The solution to death is body regeneration, that already happens. Our body mostly replaces itself via new cells over 7 to 10 years. They will manage to stop the ageing process so that regeneration brings everlasting life, though death is still possible same as now.
The ageing process could be due to DNA mutation, so one solution may be to capture the DNA of newborns and somehow ensure all new cell regeneration uses that original DNA version, perhaps by stem cell replacement on a regular basis. e.g. a sleep chamber that rolls back DNA mutation each night, so sleep will be even more refreshing than now.
Sadly wild animal eating Chinese virus transfer, religious nutters with nukes, an asteroid hit, alien invasion, or all of them, will bring human civilisation to an end or knock it back to the stone age (again
) before we reach immortality from death by natural causes. 
The solution to death is body regeneration, that already happens. Our body mostly replaces itself via new cells over 7 to 10 years. They will manage to stop the ageing process so that regeneration brings everlasting life, though death is still possible same as now.
The ageing process could be due to DNA mutation, so one solution may be to capture the DNA of newborns and somehow ensure all new cell regeneration uses that original DNA version, perhaps by stem cell replacement on a regular basis. e.g. a sleep chamber that rolls back DNA mutation each night, so sleep will be even more refreshing than now.
Sadly wild animal eating Chinese virus transfer, religious nutters with nukes, an asteroid hit, alien invasion, or all of them, will bring human civilisation to an end or knock it back to the stone age (again
) before we reach immortality from death by natural causes.
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