Normally one would not “roll back” any package as it would put them in an unsupported, partial upgrade state.
I’ve edited your topic title (since your edit window probably expired) to reflect your more specific attempted solution as outlined in your first post.
By the way, having a problem with an AUR package is a different topic then just a general question about how to do something more generic like temporarily downgrading a package.
Next time, please be more clear and concise.
Please see: