Use Alpha Vantage as an alternative to Yahoo FinancialData

https://www.alphavantage.co/documentation/

 

GOLD to EUR

https://www.alphavantage.co/query?function=CURRENCY_EXCHANGE_RATE&from_currency=XAU&to_currency=EUR&apikey=YOURKEY


SILVER to EUR

https://www.alphavantage.co/query?function=CURRENCY_EXCHANGE_RATE&from_currency=XAG&to_currency=EUR&apikey=YOURKEY