Unable to install HandyNotes addon

[cremor]

Describe the bug
I'm unable to install the addon HandyNotes. It's not showing up in search results and installing it via the CurseForge "install" link shows an error in WowUp.

To Reproduce
Steps to reproduce the behavior:

1. Try to find HandyNotes via the "install addons" search.
2. Note that it is not there.
3. Enable CurseForge install link handling in WowUp settings.
4. Click the CurseForge install link on https://www.curseforge.com/wow/addons/handynotes
5. See error

Expected behavior
I should be able to install the addon.

Screenshots
If WowUp UI language is English:

If WowUp UI language is German, the error itself has an error:

Desktop (please complete the following information):

• OS: Windows 10
• Browser: Firefox
• Version: 2.9.2-beta.1

[jliddev]

Search results are controlled by CurseForge there's not a lot we can do there.

Interestingly clicking the install link does work, sort of. currently showing classic but not retail, will look into.