LONDON, Oct 5 (Reuters) - Venture capital firm Eight Roads on Tuesday launched a $450 million fund for European and Israeli start-ups, aiming to make initial investments of $5 million to $50 million in consumer tech, software-as-a-service, fintech and healthtech. The fund, its fourth and largest to date, will invest in 15 to 20 companies, it said. Eight Roads, founded in Boston, Massachusetts, has more than 50 companies in its portfolio, including online car retailer Cazoo, Blockchain firm Fireblocks and marketing platform AppsFlyer. It launched its first European fund 10 years ago.