11.20 SR 12 to November 2018 is a supported upgrade path.
We'd recommend reading up on behaviour changes and upgrade preparations before getting started though.
You can find a lot of that here (kb 000047422). This has links to What's New information, as well as our official Upgrade section on our Help.
Reload tasks without (or with) a publisher license will come along in the upgrade, as long as you stay on the same license type. Adding a Publisher license would require you to redo them.
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