Invalid Syntax crash on Windows 10 21H2 (19044.3570) Python 3.12.0

[tomck]

E:\Downloads\fast-cli-master>fast-cli
Traceback (most recent call last):
  File "c:\users\tom\appdata\local\programs\python\python37\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "c:\users\tom\appdata\local\programs\python\python37\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\Tom\AppData\Local\Programs\Python\Python37\Scripts\fast-cli.exe\__main__.py", line 4, in <module>
  File "c:\users\tom\appdata\local\programs\python\python37\lib\site-packages\fast\__main__.py", line 1, in <module>
    from .cli import __fastcom_speedtesting__
  File "c:\users\tom\appdata\local\programs\python\python37\lib\site-packages\fast\cli.py", line 8, in <module>
    from .speedtest import FastClientSpeedTestRich
  File "c:\users\tom\appdata\local\programs\python\python37\lib\site-packages\fast\speedtest.py", line 12, in <module>
    from .async_buffer import buffered_reader
  File "c:\users\tom\appdata\local\programs\python\python37\lib\site-packages\fast\async_buffer.py", line 4, in <module>
    from .utils import ServerwiseContext
  File "c:\users\tom\appdata\local\programs\python\python37\lib\site-packages\fast\utils.py", line 39
    peak_recv_rate: tuple[float, float] = 0.0, 0.0
                                             ^
SyntaxError: invalid syntax

Installed by downloading ZIP from GitHub, running pip install ., there's no instructions in the readme about how to properly install and stackoverflow indicated that I could install this way.