The NTW3 v8.8 campaign patch only updates the 1805 European & Ottoman campaigns
(there are no changes to the Classic Battle or Hardcore mods at this time).
You need to have the NTW3 v8.7 mod installed before applying this patch.
You can download and install the NTW3 v8.7 mod from ModDB: https://www.moddb.com/mods/napoleonic-total-war-3
Follow the install instructions in this video by TSJ: https://youtu.be/lG4cEboSBpc
Download the NTW3 v8.8 campaign patch here and paste to the data_folder and use WIN RAR to "Extract Here"
Select YES to overwrite the existing files to complete the update :
Start the SP Campaign game from the NTW3 v8.7 desktop launcher and look for the NTW v8.8 SPC line at the top of the Denmark (default) faction.
(The campaign patch does not change the desktop launcher for NTW3 v8.7)
The v8.8 campaign patch change log lists the corrections & updates made to the files.
Fixed the disappearing fort issue.
Spoiler Alert, click show to read:
Fixed the missing recruited General names (error from the vanilla ntw text files).
Spoiler Alert, click show to read:
Fixed the Prussian recruitment from the Military Academy in Berlin.
Spoiler Alert, click show to read:
Fixed the the missing map names in the Play Battle option.
Spoiler Alert, click show to read: