The latest release for OASIS is v12, which you can download by contacting our National Support Centre:

• Phone: 1300 889 668 - Standard Support Hours (AET): Monday - Friday 8:00am - 8:00pm
  After Hours Support (AET): Monday - Friday 6:00pm - 8:00pm (Emergency Support Only).
  *WA Extended Hours.
  Saturday 8:00am - 2:00pm (Emergency Support Only)

The latest OASiS release notes are here:

OASiS Release Notes

If you are intending to upgrade, please check out the latest System requirements:

OASiS v12 System Requirements

Important notes:

Due to a new dependency between OASIS and SOELink in 11.17 (Jira OAS-55376), following a site upgrade to 11.17 or later, the Oasis backup (Verifyfiles.bat) will need to be re-created using Utils. This will add an SOELink shutdown and startup into the backup process (Jira OAS-55478).

The change to registration checks in v12.3 (OAS-55674) may impact sites who are running CXServer without being registered for it. When users try and open CXServer after upgrading they will receive an error message asking them to contact support and update their registration.

This is more likely to affect those sites who do not upgrade very often and are running older versions of Oasis.

If you have any questions please feel free to contact our National Support Centre via eMail: oasis@henryscheinone.com.au  or via telephone on 1300 889 668