Installer in bash

As a warning, this is my first time using bash so I am learning everything here.

I am trying to create an installer that will make it easy to deploy from a thumb drive. My problem is that after I install Python 3(I have the exe file in the same folder), once it moves on to my dependencies, I get this error:

If I rerun the same bash file and ignore or reinstall python, they install properly using pip.

It is as if the cmd tab is using the paths that were present when opened. Is there a way to update them? Or is there a better way to do this?

As a note, all our laptops are Windows 11 now so I am testing using Oracles VM VirtualBox with Windows 11 home fully updated and a snapshot so that I can start over in a fresh environment if it fails. This has saved so much time. This problem also occurred when trying on a real laptop(not VM).

Bash file:

@echo off
title My Test Installer
pushd %~dp0
set script_dir=%CD%
popd
echo Copying files from %script_dir% to C:\TestFolder
xcopy %script_dir% c:\TestFolder /s /e /i
echo Ok Windows security pop-up.
pause
echo Installing Python....
start /wait c:\Tearoffs\python-3.11.4-amd64.exe /quiet InstallAllUsers=1 Include_test=1 Include_tcltk=1 Include_pip=1 PrependPath=1 AppendPath=1
echo Finished installing Python
pause
echo Installing xlrd(Excel document reader)....
start pip install xlrd
wait
echo Installing fpdf(PDF maker)....
start pip install fpdf
wait
echo Installing fpdf2(PDF maker extention)....
start pip install fpdf2
wait
echo Installing escpos(Reciept printer controller)....
start pip install python-escpos
wait
echo Installation complete
echo Creating shortcut on desktop
echo F| xcopy %script_dir%\TestShortcutWithIcon.lnk %userprofile%\OneDrive\Desktop\TestShortcutWithIcon.lnk /q 
pause