Any tutorial how to do that correctly?
I am also interested.
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You need to replace these 4 files which are in the nis subfolder(delete 4 files which ends with 0.6.77-BETA and paste new ones that ends with 0.6.79-BETA):
nem-core-0.6.79-BETA.jar,
nem-deploy-0.6.79-BETA.jar,
nem-infrastructure-server-0.6.79-BETA.jar,
nem-peer-0.6.79-BETA.jar.