To be able to use 2023 you'll need to update your Transfer Manager to 1.6.2,
see this page on how to do that.
Step 1: Adobe Creative Cloud
To install Adobe InCopy 2023 (v 18) you must have a Creative Cloud account with a paid subscription for InCopy and the "Creative Cloud Desktop App". Your Creative Cloud account will be managed by someone in your organisation. If you are not sure about your login credentials for Adobe Creative Cloud, please contact your IT department. The "Creative Cloud Desktop App" can be downloaded here.
Step 2: CtrlPrint Transfer Manager
IMPORTANT: Make sure your version of Transfer Manager is up to date.
See the links for installing and updating Transfer Manager here.
Step 3: Downloading InCopy 2023
1. Once the Creative Cloud Desktop App is open locate InCopy in the All apps section.
Click on the three dots to the far right of the listing for InCopy and then click Other versions:
2. Click Install on the relevant version of InCopy. The latest version of InCopy 2023 is 18.5.