I saw this comment and felt like I had found a light at the end of the tunnel. Thank you so much.
But, unfortunately, I still have a problem.
After following 'Option 2: Install within QIIME 2 environment', I ran 'pip install git+https://github.com/bokulich-lab/RESCRIPt.git', but I get the following error... 
(
(rescript) [jww4557@SML test2]$ pip install git+https://github.com/bokulich-lab/RESCRIPt.git
Collecting git+https://github.com/bokulich-lab/RESCRIPt.git
Cloning GitHub - bokulich-lab/RESCRIPt: REference Sequence annotation and CuRatIon Pipeline to /tmp/pip-req-build-l0eodwax
Running command git clone --filter=blob:none --quiet GitHub - bokulich-lab/RESCRIPt: REference Sequence annotation and CuRatIon Pipeline /tmp/pip-req-build-l0eodwax
Resolved GitHub - bokulich-lab/RESCRIPt: REference Sequence annotation and CuRatIon Pipeline to commit c7c6b4e8b0d7e2f1654806e733de5326757b442f
Preparing metadata (setup.py) ... done
Building wheels for collected packages: rescript
Building wheel for rescript (setup.py) ... error
error: subprocess-exited-with-error
× python setup.py bdist_wheel did not run successfully.
│ exit code: 1
╰─> [42 lines of output]
Traceback (most recent call last):
File "", line 2, in
File "", line 34, in
File "/tmp/pip-req-build-l0eodwax/setup.py", line 14, in
setup(
File "/usr/local/lib/python3.11/site-packages/setuptools/init.py", line 87, in setup
return distutils.core.setup(**attrs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/setuptools/_distutils/core.py", line 172, in setup
ok = dist.parse_command_line()
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/setuptools/_distutils/dist.py", line 474, in parse_command_line
args = self._parse_command_opts(parser, args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/setuptools/dist.py", line 1107, in _parse_command_opts
nargs = _Distribution._parse_command_opts(self, parser, args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/setuptools/_distutils/dist.py", line 533, in _parse_command_opts
cmd_class = self.get_command_class(command)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/setuptools/dist.py", line 954, in get_command_class
self.cmdclass[command] = cmdclass = ep.load()
^^^^^^^^^
File "/usr/local/lib/python3.11/importlib/metadata/init.py", line 202, in load
module = import_module(match.group('module'))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/importlib/init.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "", line 1206, in _gcd_import
File "", line 1178, in _find_and_load
File "", line 1149, in _find_and_load_unlocked
File "", line 690, in _load_unlocked
File "", line 940, in exec_module
File "", line 241, in _call_with_frames_removed
File "/usr/local/lib/python3.11/site-packages/wheel/bdist_wheel.py", line 28, in
from .macosx_libfile import calculate_macosx_platform_tag
File "/usr/local/lib/python3.11/site-packages/wheel/macosx_libfile.py", line 43, in
import ctypes
File "/usr/local/lib/python3.11/ctypes/init.py", line 8, in
from _ctypes import Union, Structure, Array
ModuleNotFoundError: No module named '_ctypes'
[end of output]
note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed building wheel for rescript
Running setup.py clean for rescript
Failed to build rescript
ERROR: Could not build wheels for rescript, which is required to install pyproject.toml-based projects