Problem Mycroft Installation

I’m new on Mycroft.
When I try to install it I receive this error after the command :
WARNING: You are using pip version 20.0.2; however, version 20.1 is available.
You should consider upgrading via the ‘/home/silvia/mycroft-core/.venv/bin/python -m pip install --upgrade pip’ command.
Installing PEP8 check as precommit-hook
Adding mycroft-core to virtualenv path
ERROR: Could not open requirements file: [Errno 2] No such file or directory: ‘requirements/requirements.txt’
WARNING: You are using pip version 20.0.2; however, version 20.1 is available.
You should consider upgrading via the ‘/home/silvia/mycroft-core/.venv/bin/python -m pip install --upgrade pip’ command.
Warning: Failed to install required dependencies. Continue? y/N

What could I do?
I also tried to upgrade pip but it doesn’t run.
Thank you in advance

Welcome silviaromeo
The pip version is managed by Mycroft. you should try ./home/silvia/mycroft-core/installmycroft.sh or for dev ./home/silvia/mycroft-core/dev_setup.sh . what operating system do you use.

good luck
Andreas