Error 1335 PCW_CAB_QBApp

I understand the importance of having a smooth experience when installing R17 in your QuickBooks Desktop (QBDT), @Havox. Allow me to route you to the appropriate support.

I also appreciate that you've done basic steps on your end to install R17. However, since you keep getting this "Error 1335 PCW_CAB_QBApp required for this install cannot be used", I'd recommend contacting our support team to investigate this further and provide the best solution that fits your needs. 

Here's how:

1. In the top menu bar, go to Help, then QuickBooks Desktop Help.
2. Click Contact Us.
3. Input a brief description of the issue in our What can we help you with? field.
4. Hit Continue.
5. Select the appropriate option: 

•  We’ll contact you for a callback.
• Message Us to start an instant messaging session.

Additionally, you'll want to check this article and learn what's new in QBDT 2024: What’s new in QuickBooks Desktop 2024. 

We'll keep the comment section open if you need further assistance in QBDT. The Community is here, 24/7. Stay safe. 

I would do that but you can't open tickets on the weekend, that's why I came here first.