I "fixed" commenting line 26, but it is not the right way

if((Get-Module -Name "PSReadline").Version.Major -gt 1) {
#Set-PSReadLineOption -Colors $tokenColors
} else { foreach ($tokenColor in $tokenColors.GetEnumerator()) {
Set-PSReadlineOption -TokenKind $tokenColor.Name -ForegroundColor $tokenColor.Value
}}

What do you get with

(Get-Module -Name "PSReadline").Version.Major

PS C:\Users\Tommaso> (Get-Module -Name "PSReadline").Version.Major
2
PS C:\Users\Tommaso>

Maybe is my build (1809). Since i upgraded i have no color inside powershell by default.

It is possible. Line 26 was there to support third-party PSReadline module: https://www.powershellgallery.com/packages/PSReadline/, which has major version 2.
But it is hard to believe Microsoft would introduce breaking changes without a warning.
Have you tried to change line 26 to

if(false) {

so the second branch is executed?

Same issue as OP and I'm also on 1809.

I believe it is bug of 1809. I also have troubles with vscode terminal: Terminal it is not visible until u hit return. (same on phpstorm…)

@jespinoza84 @Tommasov
what is your $PSVersionTable.PSVersion