LAMF, then there is no way to install MJ without increasing of max_execution_time.
To be sure try to install via "Install from directory" method, but remove packages/plugins/terawurfl/tera_dump.sql.bz2 before push Install button.
To be sure try to install via "Install from directory" method, but remove packages/plugins/terawurfl/tera_dump.sql.bz2 before push Install button.