A complete GSX install from scratch takes about 6 minutes with an 1Gb/s connection so, make your own proportions for the connection you have (ex: should take 1 hour with a 100Mb/s connection):
https://youtu.be/5oHiuDoZB1IThe Offline installer is NOT a replacement for the installer. You can't expect a 130MB installer would "replace" 6GB of downloaded stuff so, the one and only use for the Offline installer is to get you the latest GSX **code** if you suspect you are not getting the latest updates and it might cause errors.
But before you can even use the Offline installer, you must complete at least one full installation.
In the next updates, we'll have a faster **UPDATE** process, due to some optimizations in the way we connect to update many files but, it won't affect the installation. If your connection is slow during the first part, where it downloads the main ZIP files, it can only due to:
- An antivirus problem. Configure the antivirus to exclude the whole Addon Manager folder and try again
- A firewall problem. Disable the firewall or give explicit permission to the \Addon manager\Couatl_Updater2.exe to go online
- An issue with your ISP connecting to the Cloudflare network. As explained so many times, you never download directly from us, you download from your local Cloudflare node, which is selected automatically by Cloudflare based on your location.
If your ISP has routing issues on that node, the only possible way out is try with a VPN, which will let you connect to a different node and bypass your ISP routing.