Protect powershell script from being opened, edited or modifed in Windows

I have the below powershell myscript.ps1 which I use to ask for username and password and depending on it it copies a file to a certain destination. I wanted to make this myscript.ps1 protected so no one can edit it and see the username and password and I found the solution found here which converts the powershell script to an .exe file. When I originally run the script using powershell the below credentials form appears allowing me to enter the username and password. But after the .exe is generated and when I run it the credentials form no longer appears, instead the cosole appears saying "Credential:" I don't know why? I want the credentials form to still appear when running the exe. Anythoughts please?

$credentials = Get-Credential
if ($credentials.Username -eq "user1" -And $credentials.GetNetworkCredential().password -eq "pass1")
{ Copy-Item "test1.pdf" "\test\test1.pdf"; }
else
{ Copy-Item "test2.pdf" "\test\test2.pdf"; }

Output when running the script through powershell:

Output when running the generated exe file: