Those are just warnings on packages. Though it is strange you can run the daemon but not the data-forwarder. Could you paste the results of the following commands here?
ls -l /usr/local/bin/edge*
ls -l /usr/local/lib/node_modules/edge-impulse-cli/build/cli
lrwxr-xr-x 1 mario admin 56 Dec 15 16:37 /usr/local/bin/edge-impulse-blocks -> …/lib/node_modules/edge-impulse-cli/build/cli/blocks.js
lrwxr-xr-x 1 mario admin 56 Dec 15 16:37 /usr/local/bin/edge-impulse-daemon -> …/lib/node_modules/edge-impulse-cli/build/cli/daemon.js
lrwxr-xr-x 1 mario admin 64 Dec 15 16:37 /usr/local/bin/edge-impulse-data-forwarder -> …/lib/node_modules/edge-impulse-cli/build/cli/data-forwarder.js
lrwxr-xr-x 1 mario admin 68 Dec 15 16:37 /usr/local/bin/edge-impulse-framebuffer2jpg -> …/lib/node_modules/edge-impulse-cli/build/cli/framebuffer-to-jpg.js
lrwxr-xr-x 1 mario admin 61 Dec 15 16:37 /usr/local/bin/edge-impulse-run-impulse -> …/lib/node_modules/edge-impulse-cli/build/cli/run-impulse.js
lrwxr-xr-x 1 mario admin 58 Dec 15 16:37 /usr/local/bin/edge-impulse-uploader -> …/lib/node_modules/edge-impulse-cli/build/cli/uploader.js
total 712
-rwxr-xr-x 1 mario wheel 28196 Dec 15 16:37 blocks.js
-rw-r–r-- 1 mario wheel 19814 Dec 15 16:37 blocks.js.map
-rw-r–r-- 1 mario wheel 3055 Dec 15 16:37 can-flash-serial.js
-rw-r–r-- 1 mario wheel 1433 Dec 15 16:37 can-flash-serial.js.map
-rw-r–r-- 1 mario wheel 1331 Dec 15 16:37 cbor2json.js
-rw-r–r-- 1 mario wheel 1333 Dec 15 16:37 cbor2json.js.map
-rw-r–r-- 1 mario wheel 5125 Dec 15 16:37 check-new-version.js
-rw-r–r-- 1 mario wheel 5070 Dec 15 16:37 check-new-version.js.map
-rw-r–r-- 1 mario wheel 14368 Dec 15 16:37 config.js
-rw-r–r-- 1 mario wheel 11459 Dec 15 16:37 config.js.map
-rwxr-xr-x 1 mario wheel 30950 Dec 15 16:37 daemon.js
-rw-r–r-- 1 mario wheel 24436 Dec 15 16:37 daemon.js.map
-rwxr-xr-x 1 mario wheel 25669 Dec 15 16:37 data-forwarder.js
-rw-r–r-- 1 mario wheel 21299 Dec 15 16:37 data-forwarder.js.map
drwxr-xr-x 6 mario wheel 192 Dec 15 16:37 eta-flash-tool
-rw-r–r-- 1 mario wheel 2393 Dec 15 16:37 find-serial.js
-rw-r–r-- 1 mario wheel 2040 Dec 15 16:37 find-serial.js.map
-rwxr-xr-x 1 mario wheel 4356 Dec 15 16:37 framebuffer-to-jpg.js
-rw-r–r-- 1 mario wheel 3920 Dec 15 16:37 framebuffer-to-jpg.js.map
-rw-r–r-- 1 mario wheel 1025 Dec 15 16:37 get-ips.js
-rw-r–r-- 1 mario wheel 942 Dec 15 16:37 get-ips.js.map
drwxr-xr-x 8 mario wheel 256 Dec 15 16:37 himax-flash-tool
-rw-r–r-- 1 mario wheel 5009 Dec 15 16:37 init-cli-app.js
-rw-r–r-- 1 mario wheel 4130 Dec 15 16:37 init-cli-app.js.map
-rw-r–r-- 1 mario wheel 115 Dec 15 16:37 iwebsocket.js
-rw-r–r-- 1 mario wheel 115 Dec 15 16:37 iwebsocket.js.map
-rw-r–r-- 1 mario wheel 14609 Dec 15 16:37 make-image.js
-rw-r–r-- 1 mario wheel 12503 Dec 15 16:37 make-image.js.map
-rwxr-xr-x 1 mario wheel 7301 Dec 15 16:37 run-impulse.js
-rw-r–r-- 1 mario wheel 5923 Dec 15 16:37 run-impulse.js.map
-rw-r–r-- 1 mario wheel 2936 Dec 15 16:37 serial-connector.js
-rw-r–r-- 1 mario wheel 3053 Dec 15 16:37 serial-connector.js.map
-rwxr-xr-x 1 mario wheel 16117 Dec 15 16:37 uploader.js
-rw-r–r-- 1 mario wheel 14268 Dec 15 16:37 uploader.js.map
Everything seems to be correctly installed so edge-impulse-data-forwarder should work too. You can also try going into the /usr/local/bin directory and run ./edge-impulse-data-forwarder.