plugin install

hey there,

quick question, i wrote a plugin that we plan to distribute to our
customers, they can install it "plugin install URL". the exposed URL
however is not in a versioning system but just lives on a apache
server. when i try to install it I always get

Plugin not found: ["http://b

even so the plugin file structure is right at the location. does it
always need to be in a versioning system?

thanks for your help,
stan