Some women claiming to be from unity rang me saying I owe them 60 euro a month for having downloaded the personal edition of unity from https://unity3d.com/unity/personal-edition even though its marked as free. Was this a scam?
Yes, this is a Scam. Noone from unity will ever contact you asking for money. Professional companies use Professional means.
Free Edition is FREE.
Pro edition is subject to an agreement between you and Unity and is handled up front. So again, Noone from Unity will ever contact you asking for money.