Download Adobe Captivate (2017 release) 64 bit from the download location site.
Problem
While installing Captivate (2017 release) deployment package for International English, the following error message displays:
FATAL: DW042: Language en_GB is not in the list of supported languages
Solution
To fix this issue, add Captivate (2017 installer) 64-bit installer in the Creative Cloud Packager as an offline media.
Follow the instructions:
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Download both the .7z and .exe files. Once both files are downloaded, run the .exe file and it will automatically extract the files from .7z file. Note: Ensure both 7z and exe files are downloaded in the same location. 
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All files are extracted to the folder Adobe Captivate 2017 (64 Bit). See the folder structure below: Captivate 2017 folder structure Captivate 2017 folder structure 
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Download the file Setup.zip file to your computer, unzip the file Setup.xml, and then replace the file in the location \Adobe Captivate 2017 (64 Bit)\Adobe Captivate 2017\payloads Note: Create a backup of Setup.xml in the payloads folder first. Download 
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Launch Creative Cloud Packager. Click Create Package. Creative Cloud Packager Creative Cloud Packager 
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Enter the package information. Click Next. Package details Package details 
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Enter the serial key. Click Next. Enter serial key Enter serial key 
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Clear the check-box Adobe Captivate 2017 and click Add Offline Media as shown below: Add offline media Add offline media 
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Navigate to the extracted folder of Adobe Captivate 2017 and click Extract. Click Select all and click Done. Extract Captivate 2017 folder Extract Captivate 2017 folder Once you click Done. you can see that the option Adobe Captivate 2017 is automatically selected in the next dialog. 
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Make sure that the Language selected is English (International). If not, then change the Language to English (International) manually and add the offline media again (if prompted). Choose language Choose language 
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Click Build. After the process completes, re-install the deployment package.