LEDE
wget https://github.com/jerrykuku/luci-theme-argon/releases/download/v1.7.0/luci-theme-argon_1.7.0-20200909_all.ipk
opkg install luci-theme-argon_1.7.0-20200909_all.ipk
OpenWrt
wget https://github.com/jerrykuku/luci-theme-argon/releases/download/v2.2.4/luci-theme-argon_2.2.4-20200821_all.ipk
opkg install luci-theme-argon_2.2.4-20200821_all.ipk
https://phpez.com/wp-content/uploads/2020/11/luci-theme-argon_1.7.0-20200909_all.ipk
https://phpez.com/wp-content/uploads/2020/11/luci-theme-argon_2.2.4-20200821_all.ipk