System compatibility of the still available plugins:
The available plugins all are at the newest system compatibility and security standards. They all are native 64bit,
offer native M silicon compatibility, support Windows 11 and macOS Tahoe, and are certified by Microsoft and Apple.
The offered plugin formats are VST3 and AU.
Older versions of OP-X PRO-II and Stringer in Windows still offer native 32bit and VST2 versions and compatibility down to
Windows XP SP2, and on Mac down to 10.8 (OP-X PRO-II) and 10.10 (Stringer), but no VST2 here
The plugins need a plugin host to run. So they don't offer a stand-alone version. For a quasi stand-alone mode in Windows
check the SaviHost setup guides in the last article.
OP-X PRO-II:
Newest version: Windows minimum Win 10, Mac minimum 10.13
Older versions: Windows down to Windows XP SP2, Mac down to OX-X 10.8
Stringer:
Newest version: Windows minimum Win 10, Mac minimum 10.13
Older versions: Windows down to Windows XP SP2, Mac down to OX-X 10.10
OP-X PRO-3
Windows minimum Win 10, Mac minimum 10.15