Hello Sznura,
All our products are available in Empower
https://empower.softwareag.com
On the left menu select →
“Product Documentation”
“Product Version Availability”.
You should look for NAT ,ONE or NDV for the information you are looking for.
There is no general rule for restrictions or combabilities, it is set per product per version. Please share your product versions and platform.
Natural ONE community edition could be download from this link.
I hope this helps.