Added some checks

zabbix_install.ps1

-Import-Module BitsTransfer
+#Importing module BitsTransfer
+Try
+{
+Import-Module BitsTransfer -ErrorAction stop
+}
+Catch
+{
+$ErrorMessage = $_.Exception.Message
+write-host "I cannot import the Bits module ((("
+write-host $ErrorMessage
+Break
+}
 #Getting and defining some vars
 $PathZabbix = ${env:ProgramFiles} + '\Zabbix'
 $osarch = wmic os get OSArchitecture /value
 $ZabbixConf = $PathZabbix + '\conf\zabbix_agentd.conf'
-
 #Getting monitoring server ip for Firewall Rule
 $monserverip = (Test-Connection -ComputerName monitoring.nugaev.net -count 1).IPV4Address.ipaddressTOstring
-
-
 #Downloading and unzip zabbix agent 
+Try 
+{
 $url = "https://support.nugaev.net/files/distrib/zabbix_agent.zip"
 $output = $env:TEMP
-Start-BitsTransfer -Source $url -Destination $output
+Start-BitsTransfer -Source $url -Destination $output -ErrorAction stop
+}
+Catch
+{
+$ErrorMessage = $_.Exception.Message
+$FailedItem = $_.Exception.ItemName
+write-host "I cannot download the archive ((("
+write-host $ErrorMessage
+Break
+}
+
 #unzip it 
 Add-Type -AssemblyName System.IO.Compression.FileSystem
 function Unzip
@@ -20,10 +40,9 @@ function Unzip
 
     [System.IO.Compression.ZipFile]::ExtractToDirectory($zipfile, $outpath)
 }
-
 Unzip  $output\zabbix_agent.zip $PathZabbix
 
-
+#Defining platform for version of zabbix agent
 if ($osarch -eq "OSArchitecture=64-bit")
     {
     $osarch = "win64"
@@ -33,10 +52,11 @@ else
     $osarch = "win32"
     }
 
+#Getting computer hostname for config file
 $HostnameFull ="$env:computername.$env:userdnsdomain"
-
+#Removing dot from end of the hostname (this behavior possible if computer is not domain joined)
+$HostnameFull = $HostnameFull -replace "\.(?<=\z)", ""
 #Creating config
-
 #Preparing content for config gile
 $confcont = "#This is a Nugaev NET Monitoring Server config file
 LogFile=${env:ProgramFiles}\Zabbix\log\zabbix_agentd.log