Open the invitation link the mod owner gave you.
This distribution build requires a continuous internet connection to the beta host. Access is checked before loading and approximately every 10 seconds, including while paused. The mod owner can revoke access. If access is withdrawn or approval is not renewed within 30 seconds, Minecraft uses its normal save/disconnect path and blocks further play. You must restart after access is restored.
No files are deleted or corrupted. Online access is a condition of this build. The update button requires your click, installs only after Minecraft closes and backs up your worlds and previous mod first. Downloading shares your invitation with anyone you give the JAR to; the mod owner can revoke all copies using that invitation.
Put the mod JAR in the mods folder of Minecraft 26.2 with NeoForge 26.2.0.93. Use your own Minecraft account. No worlds, launcher instance or account settings are included.