SQL Server LaunchPad "The service did not respond in a timely fashion" + No Log in ExtensibilityLog
I has this issue, this tutorial did the trick for me. 

https://www.mssqltips.com/sqlservertip/4558/sql-server-launchpad-service-cannot-be-started/

Should be noted an easy work around for me was just to change the account to NETWORK SERVICE in config manager, if you're not fussed about using a dedicated account for security reasons it will likely work for you also.