$servers = @('SVR1',SVR2',SVR3',SVR4')
## Missing leading ' on SVR2/3/4

$VMs = Get-VM -ComputerName $servers | Where-Object {$_.Version -like '8.0'}
## Not familiar with Get-VM but use -eq rather than -like when possible

#Get all VM's with Configuration Ver. 8.0
## This may be personal preference but comments should go before what it is doing rather than after

Foreach ($VM in $VMs){
    $State = $VM.State
    $VMName = $VM.Name
    #Get Current VM running state
    try {
        if ($State -like 'Running'){
        ## Use -eq if possible
            Stop-VM -VM $VM
            Write-Host "Stopping VM $VMName" -BackgroundColor Red
            #If VM is running, stop
            ## Move comments before code
        } else {"$VMName is Offline"}
        ## Personal preference again, just always include Write-Host
    }
    catch {
        Write-host "$VMName was unable to be stopped" -
        ## Accidental - left behind
    }
    $maxRepeat = 20
    While((Get-VM -ComputerName $servers -Name $VM.Name).State -like 'Running' -or $maxRepeat -eq 0){
        ## while ( ($VM.State -eq 'Running') -and ($maxRepeat -ne 0) ) {
        Write-Host "VM is still running..." -ForegroundColor Red
        $maxRepeat--
        Start-Sleep -Seconds 60
        ## The state of the VM won't change if you don't call it to stop, right?
    }
    #Check every 60 seconds to see if the VM has stopped running, or break.
    If($maxRepeat -gt 0 -or (Get-VM -ComputerName $servers -Name $VM.Name).State -like 'Off') {
    ## $maxRepeat shouldn't matter, if state is off do the following
        try {
            if((Get-VM -ComputerName $servers -Name $VM.Name).State -like 'Off'){
            ## State will be confirmed off at this point, if statement not needed
            Update-VMVersion -name $VMName -ComputerName $VM.ComputerName -Confirm:$false
            Write-Host "$VMName Configuration has been updated to 9.0"
            }
        }
        catch {
            Write-host "Unable to Update VM Configuration for VM $VMName)"
        }
    }
    If($State -like 'Running'){
    ## Again, not familiar with the VM process but if it's running already does it really need started?
        Start-VM -Name $VMName -ComputerName $VM.ComputerName
        Write-host "Starting Virtual Machine"
        #If VM was initially running, start VM again
    }

}