.

When you purchase Fences you get a license for that version (currently v3).

You can install on up to 5 of your PCs.

https://www.stardock.com/support/software_eula.aspx

One thing is still not clear for me. If i buy fences via Steam, do i need to make payment regularly to use Fences or is it one time payment to use it forever?

EULA reads something like "recurring payment subscription". I want to know if this is monthly, annually or what and how much am i going to pay to use Fences?

Please provide as much info as possible about this topic. 

Edit after answer below: I have to edit this post since i can't reply anymore. Thank you so much!

It's a one-time payment to use forever, just as with any purchased program...;)