I hope this is the correct location for this issue. I did not find another way to report this.
Here https://portableapps.com/support/portable_app#installing
It says: just click Options and then Install a New App
in 2 different locations.
With the current version of the platform, it should say:
just click Apps and then Install a New App
Thanks, it's been updated.
Sometimes, the impossible can become possible, if you're awesome!