You cannot just refresh your old bookmark. The 1.0 version is cached separately. Here is the step-by-step guide to getting the running right now.
If you play on a school or public Eaglercraft server, you know the pain of "ReadTimeoutException." eaglercraft 110 upd
Official and community builds are often archived on GitHub - 3kh0/eaglercraft-builds . You cannot just refresh your old bookmark