[JasonFriday13]

If you have nsis 3, try this:

!define IHUB_PRODUCT_NAME "OpenText Magellan BI & Reporting System Console 16.6"
!define IHUB_PRODUCT_NAME_DA "OpenText Magellan BI && Reporting System Console 16.6"

Name "${IHUB_PRODUCT_NAME}" "${IHUB_PRODUCT_NAME_DA}"

Name has an optional parameter for using doubled ampersands.

Also, you can use defines within defines:

!define IHUB_PRODUCT_VERSION "16.6"
!define IHUB_PRODUCT_NAME "OpenText Magellan BI & Reporting System Console ${IHUB_PRODUCT_VERSION}"
!define IHUB_PRODUCT_NAME_DA "OpenText Magellan BI && Reporting System Console ${IHUB_PRODUCT_VERSION}"