I'd been having hard drive issues, so I decide to go on and get new one.
Obviously the computer is super fast and had to reinstall everything, including S1. The Alesis V25 was immediately recognized when I added it as an external device.
Here's what Presonus Tech Support told me:
"From your findings it appears that there is a specific issue with those devices and compatibility with Studio One 4.
From researching the websites of the manufacturers, the instructions for installing the devices in Studio One relate only to Studio One v.2. It is, therefore, entirely possible that the keyboards have been discontinued and the devices drivers just simply will not work in Studio One 4.
So, I recommend you email their support to confirm or deny this theory.
I'm gonna send this message to Alesis tech support and see what they say.