Update download.sh for v6.0.0-alpha.14
Update download.sh for v6.0.0-alpha.14

JamesWTruher/PowerShell-1,daxian-dbw/PowerShell,JamesWTruher/PowerShell-1,JamesWTruher/PowerShell-1,TravisEz13/PowerShell,TravisEz13/PowerShell,JamesWTruher/PowerShell-1,PaulHigin/PowerShell,daxian-dbw/PowerShell,daxian-dbw/PowerShell,TravisEz13/PowerShell,PaulHigin/PowerShell,TravisEz13/PowerShell,PaulHigin/PowerShell,PaulHigin/PowerShell,daxian-dbw/PowerShell