Asset Bundles - loading locally and few questions

I want to use asset bundles for application which don't need internet connection. I am using AsseBundleManager provided by Unity from asset store and I've got everything to work with simulation mode. After build I see in output_log error:

Failed downloading bundle Windows from PROJECT_DIRECTORY/Windows/Windows: Could not resolve host: D

Now I don't know how to resolve it, everything I found in internet is about downloading bundles, I want them only locally!

Another thing I want to ask is, do all asset bundle need to be decompressed at application start? I was reading some posts about it and this is scary for me :/ Also I saw game Rust is launching very long time with text "Loading asset bundles..."