1- install python 3.9 in your system .
2- clone github repo : https://github.com/ibrahimdsv/odoo14-wheels.git
3- go to the folder off your system ( if your system is windows go to : wheels_win32 , else if your system is linux go to wheels_linux) with this command : cd wheels_win32 or cd wheels_linux .
4- execute this command : pip install --no-index --find-links . -r requirements.txt
Thats all enjoy your odoo 14 environnement is ready !!! .