I see. No, I haven't bought any extensions through steam.
Until recently, before I migrated from Windows to Linux, I was mainly using SAM for it's base plugin (autogate functionality) via SAM 2 Suite. Beside this plugin I occasionally used Seasons + Vegetation libs. As I was setting up everything related to XP11 from scratch I noticed that there is a new version of SAM and I decided to set it up.
I managed yesterday to install version 2 under Linux via SAM 2 Suite via minor altering of some steam lib-curl library dependency (had to symlink to a newer version) and it seems to work fine for my needs. I will be sticking to this version until a fix is provided. Thank you for your support.