Okay so this is a common mistake that a lot of us made including myself did you perhaps double click twice or once on the DLC files if u clicked once you should see this

Don't worry it happened to me just do this 👇🏽
(Before u continue make sure ur DLC and the base game file has been extracted/unzipped)
(Window & Linux): Unfortunately I do not have Mac so if it's Mac sorry I can't be of help
Step 1. Locate the DLC
Step 2.(This one is crucial) Double click one time on the DLC file
Step 3. Once you've locate "14 Nights With You" Right click on it and press copy or however u usually copy files
Step 4. Head to the base game and click on that
Step 5. Locate the "game" file and click on that
Step 6. Right click or whatever u do to usually paste the "14 Nights With you" in there
Step 7. Once that done load up the game like you usually do and it should say the DLC is installed in the upper right corner of your screen
Don't worry it happened to me just do this 👇🏽
(Before u continue make sure ur DLC and the base game file has been extracted/unzipped)
(Window & Linux): Unfortunately I do not have Mac so if it's Mac sorry I can't be of help
Step 1. Locate the DLC
Step 2.(This one is crucial) Double click one time on the DLC file
Step 3. Once you've locate "14 Nights With You" Right click on it and press copy or however u usually copy files
Step 4. Head to the base game and click on that
Step 5. Locate the "game" file and click on that
Step 6. Right click or whatever u do to usually paste the "14 Nights With you" in there
Step 7. Once that done load up the game like you usually do and it should say the DLC is installed in the upper right corner of your screen
Question does it say DLC installed in the upper corner if not don't worry it happened to me just do this 👇🏽
(Before u continue make sure ur DLC and the base game file has been extracted/unzipped)
(Window & Linux): Unfortunately I do not have Mac so if it's Mac sorry I can't be of help
Step 1. Locate the DLC
Step 2.(This one is crucial) Double click the DLC
Step 3. Once you've locate "14 Nights With You" Right click on it and press copy or however u usually copy files
Step 4. Head to the base game and click on that
Step 5. Locate the "game" file and click on that
Step 6. Right click or whatever u do to usually paste the "14 Nights With you" in there
Step 7. Once that done load up the game like you usually do and it should say the DLC is installed in the upper right corner of your screen
(Window & Linux): Unfortunately I do not have Mac
Step 1. Locate the DLC (make sure both the DLC and base game have been extracted/unzipped before u continue)
Step 2.(This one is crucial) Double click the DLC
Step 3. Once you've locate "14 Nights With You" Right click on it and press copy or however u usually copy files
Step 4. Head to the base game and click on that
Step 5. Locate the "game" file and click on that
Step 6. Right click or whatever u do to usually paste the "14 Nights With you" in there
Step 7. Once that done load up the game like you usually do and it should say the DLC is installed in the upper right corner of your screen