Hi Marek,
Welcome to the Roon Community.
You may be able to get Roon to run on that machine, but it will be slow (especially when you first set it up) and you may have other problems too:
Because it does not meet Roon specifications, Roon will not be obligated to support issues that arise (although they sometimes help if its easy). If you are able to search this forum, you may be able to find out if others have had good experiences.
Roon is a resource-intensive beast, and really needs to have fast memory (SSD) a fairly powerful CPU (Intel i3, or better) and a robust network to give the desired experience.