PowerShell remove-module - sql-server

Question

on a local Server I've got a bunch of sub-folders containing PowerShell-scripts, one of those is "sqlserver" folder contains Microsoft sqlserver module. I've got a daily task-scheduler job connecting a sql-server, there is a zip-file having the same sub-folder structure (with a folder: sqlserver) as on the local server.
The idea is to overwrite the local folder structure with the new structure from the zip-file.
The problem is the module "sqlserver" which I need to connect to sql server and get the zip file etc. Trying to overwrite it I get an error. I've tried to remove-module but it doesn't work as well.
The code:
try
{
[decimal]$lokaleVersion = 3.01 #
$deploymentVersion = 0
[string]$filetype = 'PS'
if($zipObject = Get-ZIPFile -lokaleAdminDBVersion $lokaleVersion -filetype $filetype -build 0)
{
$deploymentVersion = $zipObject.aktScriptVersion
if($deploymentVersion -gt $lokaleVersion)
{
Remove-Module -name sqlserver -Force
Unzip-File -zipObject $zipObject -zipname $filetype -modulePath $modulePath #error Access denied
$SubFolders = dir ($modulePath) | Where-Object {($_.PSIsContainer) -and ($_.Name -ne "sqlserver")} | ForEach-Object -Process {$_.FullName} -ErrorAction Stop
Import-Module -Name sqlserver -DisableNameChecking -Force
ForEach ($Folder in $SubFolders)
{
try
{
$a = (join-path -Path $modulePath -ChildPath ($folder.Split("\")[-1]) -Resolve) + "\" + "installer.ps1"
if(Test-Path ($a))
{
& $a
}
}
catch
{
Write-LogFile -Message $($Error[0].exception.message) -severity Fehler -modul $module
}
}
}
}
}
catch
{
if ($error[0].exception.message) {$message = $error[0].exception.message}
Write-LogFile -Message $message -severity Fehler -modul $module
}
It's important to overwrite the sub-folders (I'm updating the scripts) and the sqlserver-module should be updated regularly.
Thanks for your help.