Getting below error on running PowerShell script - powershell

Question

I am using one PowerShell script to download content (a zip file) from a website which requires credentials to get authenticated for the website. Also, have used proxy and proxy credentials since it is an authenticated proxy. I am getting an error which I have pasted below.
I have tried giving the proxy and proxy credentials but no luck.
I have bypassed the execution policy using Powershell -ExecutionPolicy Bypass.
When I try accessing the website from my browser then I am able to access the zip file.
Please find the code snippet below:
#Path to Save data
$tipath = "C:\Somepath"
$localpath = "\somefile.zip"
$timepath = "\Zip_file.txt"
$unzippath = "\Someotherpath"
$storepath = $tipath + $localpath
$remotefilepath = $tipath + $timepath
$unzipfolder = $tipath + $unzippath
# Create Folder If Not Exists #
$FolderToCreate = $tipath
if (!(Test-Path $FolderToCreate -PathType Container)) {
New-Item -ItemType Directory -Force -Path $FolderToCreate
}
#Downloading File #
$username = "username"
$password = "Password" | ConvertTo-SecureString -AsPlainText -Force
$cred = New-Object System.Management.Automation.PSCredential($username, $password)
$secPasswd = "password123" | ConvertTo-SecureString -AsPlainText -Force
$wc = New-Object System.Net.WebClient
$wc.Credentials = New-Object System.Net.NetworkCredential("domain\user", $secPasswd)
# get remote file info
Invoke-WebRequest -Proxy "http://x.x.x.x:8080" -ProxyCredential $myCreds -Uri "https://somewebsite/checksum.txt" -OutFile $remotefilepath -Credential $cred
$remotefile = Get-Content -Path $remotefilepath
Write-Host Remote File Hash : $remotefile
# if the file exists already
if (Test-Path $storepath) {
# get local file info
$localfile = (Get-FileHash $storepath -Algorithm SHA256).Hash
Write-Host Local File Hash : $localfile
# if the remote file is newer than the local file
if ($remotefile -ne $localfile) {
Invoke-WebRequest -Proxy "http://x.x.x.x:8080" -ProxyCredential $myCreds -Uri "https://somewebsite/checksum.txt" -OutFile $remotefilepath -Credential $cred
Invoke-WebRequest -Proxy "http://x.x.x.x:8080" -ProxyCredential $myCreds -Uri "https://somewebsite/somezipfile.zip" -OutFile $storepath -Credential $cred
This code should check the hash and download directly download the zip file from the website and unzip it.
If it can download in the zip file then the later part I can troubleshoot.
PS C:\Users\Administrator\Desktop> powershell -ExecutionPolicy ByPass -File C:\Users\Administrator\Desktop\mypowershell.ps1
powershell : Invoke-WebRequest : .?? ??? ?????? ???????? ??? ????? ?????
At line:1 char:1
+ powershell -ExecutionPolicy ByPass -File C:\Users\Administrator\Desktop\mypowershell.p ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (Invoke-WebReque...??? ????? ?????:String) [], RemoteException
+ FullyQualifiedErrorId : NativeCommandError
The site you are trying to access contains content that is prohibited.
If you believe the website you are trying to access does not contain any such
content, please click here.
Above is the error I am getting.