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krs, my apologies. It seems like every time I look at the App Store they have changed it again. It was always Apple's process to remove the previous macOS when a new one was released and after a time return it on the App Store. It seems this is no longer the case. Apparently you can download the installer again IF you are actually running Mojave or an earlier macOS version, as in the case where you have performed a macOS restore from the Recovery Partition. If on the other hand you have upgraded to macOS Catalina you can't, at least not in the usual way. For this reason I created a bootable macOS Mojave installer on a thumb drive before upgrading to Catalina but it will expire over time and in order to use it I would have to erase my HD first.
Since you actually still have a viable copy of the installer I would suggest following Randy's instructions.
Since you actually still have a viable copy of the installer I would suggest following Randy's instructions.