How to Update 5 unit license through Norton manage portal?

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How to update Norton Internet Security license "5 device 1 user" license, using pre purchased retail key through Norton account manage portal?

Available is only "Buy new" at 2.5 higher price then retail price.

So far I have entered retail key from NIS renew option but this requires physically accessing all 5 devices and entering a new subscription key.

Sometimes I must therefore create each year a new Email address and Norton account to use retail key.

Until devices are in different locations single license update point with pre paid key would be the best solution.

Any ideas?

Thanks.