I hope things run more smoothly for you from now on!

Comparing both, I think I found the problem. The index page name was autofilled with the website url and not with index.html like the others. Now that I changed that, it works. I now feel dumb for not noticing that before haha.

That's good to hear. Thank you for letting me know.

That's odd. Are you saying that JuiceboxBuilder-Lite works but JuiceboxBuidller-Pro does not? I can't think of any reason why this might be.
Both applications share a lot of similar code, including the code that handles saving a gallery on the 'Publish' tab. If one application works, the other should, too.

I'm glad you've at least now got a way to make a gallery, even if it's not ideal.
If I think of anything else that might help, I'll be sure to post back here to let you know.

It's in fact an admin account so it's not the problem and all files are on the pc.
For my different try, I put the folder on desktop so it's easier to find when trying again.

I tried to make a new gallery, it works now. (It didn't at first)
Seems I have to make new gallery to upgrade the Juicebox-Lite one to the Pro version.
(I already changed the jbcore folder as said in tutorials)

I now seem to have a solution even if it's not the fastest one, haha. Thanks :)

Do you have any anti-virus or security software installed (other than Microsoft Defender) which might somehow be interfering with JuiceboxBuilder-Pro's functionality?
If so, try temporarily disabling it to see if this helps. (Pease do so at your own risk and be sure to disconnect from the internet first.)

If this is not the problem, then have you tried creating a new empty folder on your desktop and saving your gallery to there?

Make sure that you are not trying to save the gallery to a destination that is actively being synced to an online backup or file sharing service (like Dropbox or Google Drive) and this has been known to cause problems.

JuiceboxBuilder-Pro is fully compatible with Windows 11 so there should be no problems associated with your operating system.

Out of interest, are you running Windows on an administrator user account? Have you tried using a different user account in case your current user account is somehow corrupt?

Sorry for all the questions but I'll probably need a little more information to help further. Maybe if you let me know the exact path that you are trying to save the gallery to (in the 'Gallery Folder' box on the 'Publish' tab), it might help to troubleshoot your problem.

Please let me know how you get on.