cd tcp_server_0.1 ./bin/tcp_server console进入erlang的shell release_handler:which_releases().
看到的应该是0.1
然后解压0.2的包，安装进入
erl> release_handler:unpack_release("tcp_server_0.2").
erl> release_handler:install_release("0.2").
erl> release_handler:make_permanent("0.2").
erl> release_handler:which_releases().