ESO Addon Manager arviceblot
Use this command to install ESO Addon Manager:
winget install --id=arviceblot.eso-addon-manager -e Cross platform addon manager for the Elder Scrolls Online
winget install --id=arviceblot.eso-addon-manager -e Cross platform addon manager for the Elder Scrolls Online
A cross-platform, unofficial addon manager for The Elder Scrolls Online compatible with the Steam Deck.

The recommended installation method is to use the version from flathub. This has the added benefit of centralized updates.
Or using the flatpak CLI:
flatpak install com.arviceblot.eso-addon-manager
cargo install --git https://github.com/arviceblot/eso-addons.git
Download and run the appropriate file for your OS from the releases page.
Either run using the desktop file flatpak installs or from the CLI:
flatpak run com.arviceblot.eso-addon-manager
cargo run eso-addon-manager
This project was originally based on the work by Trojan295 at Trojan295/eso-addons. It has since devolved into the abyss, but without his work I probably would not have even started on this silliness.