Once downloaded, no internet connection is required. It's a single HTML file you can keep on a flash drive. Bypasses Restrictions:
: EaglercraftX 1.8 includes an integrated server for singleplayer mode, ensuring a stable experience without needing an external host. 🚀 How to Get and Use the Offline Version Eaglercraft --39-LINK--39- Download Offline
: A repository containing offline-ready HTML files for versions ranging from Indev to 1.12.2. How to Use the Offline Client Once downloaded, no internet connection is required
This is a gray area. Eaglercraft is not endorsed by Mojang or Microsoft. However, because it is a reverse-engineered recreation of an old Beta version (1.5.2), many legal experts consider it "abandonware" preservation. Eaglercraft --39-LINK--39- Download Offline