Here are a couple of examples you might find:

Offline clients do not update automatically. If you want the latest features or bug fixes for a client, you need to return to the website or repository where you originally downloaded it and get the newest version.

Playing the offline variant preserves nearly all the critical components of the standard Java engine. It bridges the gap between limited device hardware and full-scale gameplay: Download Eaglercraft Offline Clients

To download the offline version safely, use these official or community-verified links:

Minimize browser overhead by closing unnecessary tabs and extensions that consume RAM. In-Game Video Settings (1.8.8 OptiFine Features)