Gantry 5 Helium and bootstrap and Phocadownload: incompatible?

[fabio42170]

Hey there,
After using Phocadownload's developers' patience, I'm coming here to fetch some help.
I have Gantry 5, the latest version of Joomla 5 and the latest version of phocadownload.
Phocadownload seems to be having troubles because there are 2 versions of bootstrap cohabiting. They seem to be in conflict.
Here's an excerpt from our discussion with the developers: for the full discussion: https://www.phoca.cz/forum/viewtopic.php?t=65852

I don't know if Gantry already loads bootstrap or not. I've checked in the parameters and it seems there's nothing you can really set or deactivate.

I suspect it's Gantry. Also, see the 2 bootstrap versions:

https://www.4u2learn.fr/joomla/media/ga ... strap5.css

https://www.4u2learn.fr/joomla/media/co` ... ap.min.css

The main reason calling for help is that it seems Gantry keeps using the old Bootstrap version (2.3.2).
My question is : how to force Gantry using one and only one version of Bootstrap (the latest one, namely 5)? Is it possible to remove the old version of Bootstrap?

Thanks a lot for your help and sorry for not developing much on a thread which has been going on for days now with the Phocadownload developers! (they kindly redirected me to you)
Fabrice