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With Mojave, we can no longer use 32-bit applications. Will you update the Thesaurus to a 64-bit version? Or tell me how to use just the Thesaurus in the Nisus Writer app. I use Ulysses and want to continue to use the Thesaurus.

Thanks and kind regards,
M.

Nisus Thesaurus was integrated directly into Nisus Writer Pro from version 2.1 onwards which first switched to 64-bit.
Therefore, you do not need the stand alone 32-bit Nisus Thesaurus to use it with NWP 2.1 and subsequent updates.
https://nisus.com/pro/releasenotes/releasenotes21.php

IN NWP, you can access the Thesaurus in the Tooldrawer from the Writing Palette Group under Language, or you can have the Language palette floating.