Hi @MikeSangray2019 ,
As you're planning to upgrade from one feature release to later feature release, you can't skip installation of the feature release which is in the path. So in your case, you need to follow below upgrade path -
8.1-->9.0-->9.1.0 (Download Base Release)-->9.1.x (Download & Install Target Version)
Also it is recommended to install latest maintenance release in each release version before you install the base image of next feature release. So you can follow upgrade path given in below article.
Hope it helps!
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