Get-BinRoot defaulted to "C:\" instead of "C:\tools"
This is because line 15 set $binRoot to C:\tools, but did not set
$env:ChocolateyBinRoot. Thus, the expression on line 23 evaluates
$false (because $env:ChocolateyBinRoot is still $null), so line 25
overwrites $binRoot with just "C:\".