I figured out what happened!
Godaddy's Installatron installed the modules-file in the admin folder. (I figured that out by looking at the URL of the working module list)
I first tried to install form-tools, manually on my own, in a folder I had made and failed.
And I was trying to install form-builder in the failed location.
I used the cPanel-File-manager to drag and drop the "form builder"-file into the ""modules"-file at the correct location.
Now I can see it in the working module list.
Thank you Alexh for replying in the "Modules thread" you were right "That's weird"!
I tried to reinstalled form-builder by first putting it into the modules file, in my computer, then uploading the whole modules file, replacing the original.
When that didn't work, I started comparing the URL of the working modules list and the location I was tying to add form-builder, when I used FileZilla.
Godaddy's Installatron installed the modules-file in the admin folder. (I figured that out by looking at the URL of the working module list)
I first tried to install form-tools, manually on my own, in a folder I had made and failed.
And I was trying to install form-builder in the failed location.
I used the cPanel-File-manager to drag and drop the "form builder"-file into the ""modules"-file at the correct location.
Now I can see it in the working module list.
Thank you Alexh for replying in the "Modules thread" you were right "That's weird"!
I tried to reinstalled form-builder by first putting it into the modules file, in my computer, then uploading the whole modules file, replacing the original.
When that didn't work, I started comparing the URL of the working modules list and the location I was tying to add form-builder, when I used FileZilla.