Ошибка при установке питона 0x80070643

I had the same problem installing Python version 3.9 for the first time on my Windows 10, as this same problem happens to many users trying to install Python, the best solution I accidentally, just like @MANAN AGGARWAL discovered trying to check if I already had a version of Python installed on my computer by the DOS Command Prompt, was:

Open the DOS Command Prompt (cmd) and dictate «python»: if a screen shows you a version, it’s clearly not the first time you’ve installed Python, so if you want to upgrade you should try: https: / /www.delftstack.com/en/howto/python/how-to-update-python/ But if you’ve never installed any version of Python, the solution lies in updating your operating system to the latest version through Windows Update, and open the command prompt and type Python, or go directly to the Microsoft Store and search for Python followed by its latest version. It works without error.
** If by chance it does not automatically install on your PC after downloading, click «install on my devices» and select your computer name.

Why can’t I install Python directly from the website file? Please note that when trying to install any software/applications from outside Microsoft’s trusted locations, there are high chances of user settings interfering with the installation. When coming, for example, from the Microsoft Store, a chance of success is much greater, even without having problems related to User Permission Settings.

Another important thing to point out here is that installing a lot of software from outside Microsoft’s trusted platforms can cause you to change some user permissions which can have positive effects with some software and negative effects with others, even with security your own system if you don’t know what you’re doing.

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2021-03-28.03:23:15.318>
created_at = <Date 2019-08-04.15:22:58.615>
labels = ['3.7', 'invalid', 'type-bug', 'expert-installation', 'OS-windows']
title = 'Error 0x80070643 when installing'
updated_at = <Date 2021-03-28.03:23:15.316>
user = 'https://bugs.python.org/bfbfbfbbfbfbf'

bugs.python.org fields:

activity = <Date 2021-03-28.03:23:15.316>
actor = 'eryksun'
assignee = 'none'
closed = True
closed_date = <Date 2021-03-28.03:23:15.318>
closer = 'eryksun'
components = ['Installation', 'Windows']
creation = <Date 2019-08-04.15:22:58.615>
creator = 'bfbfbfb bfbfbf'
dependencies = []
files = ['48529']
hgrepos = []
issue_num = 37756
keywords = []
message_count = 5.0
messages = ['348988', '349336', '349340', '349355', '349364']
nosy_count = 7.0
nosy_names = ['terry.reedy', 'paul.moore', 'tim.golden', 'zach.ware', 'eryksun', 'steve.dower', 'bfbfbfb bfbfbf']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue37756'
versions = ['Python 3.7']

Here’s the solution that worked for me.

AFTER all the operations in the OT, I’ve run Python 3.8 NORMAL installer and chose not to install py launcher, this made Python successfully install.

After this step, I have added Python and Python/Script folders to my PATH and in cmd, python —version showed the correct version installed.

THEN I got the last problem (the imgurl one), when trying to see pip version and install pip using python from command line. I fixed this last problem by opening again the Python installer and perform an installation repair. After this, I made sure I could use python and pip commands and that’s it.

I didn’t launch anything as administrator nor performed any reboot while doing these last operations.