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The beta 1 in your maven repos appears to be missing 'vaadin-maven-plugin'.
I've updated my pom to 7.6.0.beta1 and all of the jars download successfully except for the 'vaadin-maven-plugin'.
Did you add the vaadin-prereleases as a plugin repository? At least for me it seems to be there and I've used it in several test projects.
I've got the following repo in my pom:
<repository> <id>vaadin-prereleases</id> <name>Vaadin Pre-releases</name> <url>https://maven.vaadin.com/vaadin-prereleases</url> </repository>
At the very bottom of the release page is the following content:
<pluginRepositories> <pluginRepository> <id>vaadin-prereleases</id> <name>Vaadin Pre-releases</name> <url>https://maven.vaadin.com/vaadin-prereleases</url> </pluginRepository></pluginRepositories>
This is the definition of the repository where the plugins are searched for.