解决宝塔面板 Flask 版本不正确导致下载文件报错

本文同时提供以下语言的翻译：正體中文 English

1、起因

前段时间折腾宝塔面板，装不上宝塔云控，强行执行btpip install -r requirements.txt，结果把宝塔的Python环境搞炸了，删掉重装。

然而，重装宝塔Python环境并没有解决我的问题。

2、错误描述

在宝塔面板的文件管理页面，点击下载文件，会提示：

Text

     出错了，面板运行时发生错误！
TypeError: send_file() got an unexpected keyword argument 'etag'
REQUEST_DATE: 2023-01-23 21:19:14
 PAN_VERSION: 7.9.7
  OS_VERSION: CentOS  7.9.2009 x86_64(Py3.7.9)
 REMOTE_ADDR: 211.156.80.226
 REQUEST_URI: GET /download?filename=%2Fwww%2Fwwwroot%2Furl%2Fgo_xxWdbE.tar.gz
REQUEST_FORM: {}
  USER_AGENT: Mozilla/5.0 (Linux; Android 9; CMR-W09) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36 EdgA/108.0.1462.54
Traceback (most recent call last):
  File "/www/server/panel/pyenv/lib/python3.7/site-packages/flask/app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/www/server/panel/pyenv/lib/python3.7/site-packages/flask/app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/www/server/panel/pyenv/lib/python3.7/site-packages/flask/app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/www/server/panel/pyenv/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/www/server/panel/pyenv/lib/python3.7/site-packages/flask/app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "/www/server/panel/pyenv/lib/python3.7/site-packages/flask/app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/www/server/panel/BTPanel/__init__.py", line 1025, in download
    max_age=0)
TypeError: send_file() got an unexpected keyword argument 'etag'  
  