Sorry to hear about this.
As stated in 1.2.8.7.1, access to ACF Groups that don’t explicitly have the API REST option enabled is disabled by default.
You can either enable the API REST feature on the specific ACF Groups you wish to load on the frontend or simply go to Cwicly Settings → Advanced Settings → untoggle Require ACF API REST
We always advise to check out the changelog before updating Cwicly. Also, it is a general recommendation to always process the update beforehand on a staging environment/clone to make sure things are running smoothly.
We will not be providing an area to download past versions of Cwicly as this always leads to increased support requests for past versions. However, simply contacting us at support@cwicly.com for a previous version always works.