If your software the Stand-Alone Addon Manager used the services Amazon S3, In from Venezuela the Server provider Internet the government was blocked of the servicers Amazon S3.
Old versions of our installer used one server on Dropbox, which uses Amazon S3, but the current version (since more than a year) use our own server so no, this is not the issue, unless you tried to use an old installer.
Everything you mentioned I've done, and still can not get install; I uninstalled the antivirus and turn off the Windows Firewall and etc, I restarted my computer, and I can not install successfully.
That's not the case. The question "No internet connection available, press Next to use bglmanx files" means that, if you press the NEXT button, the installer won't try to download anything, and will proceed with the version of the files that are included in the installer.
If you downloaded the latest installer now, they are the same as the one that are online so, there will be no difference.