Hi Robert,
When you import your project into CCS v5.4, your project should build without problems with the v4.4.1 compiler without changing any of the project's properties. But if you need to use the older compiler for a particular reason, you can download it here: https://www-a.ti.com/downloads/sds_support/TICodegenerationTools/download.htm , and then add it to the list of compilers in your CCS through the Preferences > CCS > Build > Compilers page.
- Baltasar