I tried to install eos on macbook and got that error while running command checkout exacly like on the video:
users-air:eos user$ git checkout dawn-v4.2.0
error: The following untracked working tree files would be overwritten by checkout:
libraries/fc/CMakeLists.txt
libraries/fc/GitVersionGen/GetGitRevisionDescription.cmake.in
libraries/fc/include/fc/actor.hpp
libraries/fc/include/fc/aligned.hpp
libraries/fc/include/fc/any.hpp
libraries/fc/include/fc/api.hpp
libraries/fc/include/fc/array.hpp
libraries/fc/include/fc/bitutil.hpp
libraries/fc/include/fc/bloom_filter.hpp
libraries/fc/include/fc/compress/smaz.hpp
libraries/fc/include/fc/compress/zlib.hpp
libraries/fc/include/fc/container/deque.hpp
libraries/fc/include/fc/container/deque_fwd.hpp
libraries/fc/include/fc/container/flat.hpp
libraries/fc/include/fc/container/flat_fwd.hpp
libraries/fc/include/fc/crypto/aes.hpp
libraries/fc/include/fc/crypto/base32.hpp
libraries/fc/include/fc/crypto/base36.hpp
libraries/fc/include/fc/crypto/base58.hpp
libraries/fc/include/fc/crypto/base64.hpp
libraries/fc/include/fc/crypto/bigint.hpp
libraries/fc/include/fc/crypto/blowfish.hpp
libraries/fc/include/fc/crypto/city.hpp
libraries/fc/include/fc/crypto/common.hpp
libraries/fc/include/fc/crypto/dh.hpp
libraries/fc/include/fc/crypto/digest.hpp
libraries/fc/include/fc/crypto/elliptic.hpp
libraries/fc/include/fc/crypto/elliptic_r1.hpp
libraries/fc/include/fc/crypto/equihash.hpp
libraries/fc/include/fc/crypto/hex.hpp
libraries/fc/include/fc/crypto/hmac.hpp
libraries/fc/include/fc/crypto/openssl.hpp
libraries/fc/include/fc/crypto/pke.hpp
libraries/fc/include/fc/crypto/private_key.hpp
libraries/fc/include/fc/crypto/public_key.hpp
libraries/fc/include/fc/crypto/rand.hpp
libraries/fc/include/fc/crypto/ripemd160.hpp
libraries/fc/include/fc/crypto/sha1.hpp
libraries/fc/include/fc/crypto/sha224.hpp
libraries/fc/include/fc/crypto/sha256.hpp
libraries/fc/include/fc/crypto/sha512.hpp
libraries/fc/include/fc/crypto/signature.hpp
libraries/fc/include/fc/exception/exception.hpp
libraries/fc/include/fc/filesystem.hpp
libraries/fc/include/fc/fixed_string.hpp
libraries/fc/include/fc/fwd.hpp
libraries/fc/include/fc/fwd_impl.hpp
libraries/fc/include/fc/git_revision.hpp
libraries/fc/include/fc/interprocess/container.hpp
libraries/fc/include/fc/interprocess/file_mapping.hpp
libraries/fc/include/fc/interprocess/iprocess.hpp
libraries/fc/include/fc/interprocess/mmap_struct.hpp
libraries/fc/include/fc/interprocess/process.hpp
libraries/fc/include/fc/io/buffered_iostream.hpp
libraries/fc/include/fc/io/console.hpp
libraries/fc/include/fc/io/datastream.hpp
libraries/fc/include/fc/io/enum_type.hpp
libraries/fc/include/fc/io/fstream.hpp
libraries/fc/include/fc/io/iobuffer.hpp
libraries/fc/include/fc/io/json.hpp
libraries/fc/include/fc/io/json_relaxed.hpp
libraries/fc/include/fc/io/raw.hpp
libraries/fc/include/fc/io/raw_fwd.hpp
libraries/fc/include/fc/io/raw_unpack_file.hpp
libraries/fc/include/fc/io/raw_variant.hpp
libraries/fc/include/fc/io/sstream.hpp
libraries/fc/include/fc/io/varint.hpp
libraries/fc/include/fc/log/appender.hpp
libraries/fc/include/fc/log/console_appender.hpp
libraries/fc/include/fc/log/file_appender.hpp
libraries/fc/include/fc/log/gelf_appender.hpp
libraries/fc/include/fc/log/log_message.hpp
libraries/fc/include/fc/log/logger.hpp
libraries/fc/include/fc/log/logger_config.hpp
libraries/fc/include/fc/make_fused.hpp
libraries/fc/include/fc/network/ip.hpp
libraries/fc/include/fc/network/message_buffer.hpp
libraries/fc/include/fc/network/resolve.hpp
libraries/fc/include/fc/network/udp_socket.hpp
libraries/fc/include/fc/network/url.hpp
libraries/fc/include/fc/noncopyable.hpp
libraries/fc/include/fc/optional.hpp
libraries/fc/include/fc/platform_independence.hpp
libraries/fc/include/fc/real128.hpp
libraries/fc/include/fc/reflect/reflect.hpp
libraries/fc/include/fc/reflect/typename.hpp
libraries/fc/include/fc/reflect/variant.hpp
libraries/fc/include/fc/rpc/api_connection.hpp
libraries/fc/include/fc/rpc/binary_api_connection.hpp
libraries/fc/include/fc/rpc/cli.hpp
libraries/fc/include/fc/rpc/http_api.hpp
libraries/fc/include/fc/rpc/json_connection.hpp
libraries/fc/include/fc/r
Aborting
users-air:eos user$