Did you update the beta wearable app on your phone? This must be done through the samsung members app. Click the banner for watch oneui6 beta, scroll down to watch 4 wearable app and click download, follow the prompts.
Yeah i got a private message from someone looking for apks to sideload. I have them, including a working version of facebook Messenger but all on how to do it can't be discussed here or Samsung can ban you so its easier just to refer them to XDA, ill help and guide there, But This forum is for the betas, to improve the current and future o.s. not discuss anything outside that topic.
I installed the watch manager from the members app before I downloaded the beta one ui6 app. You were right that I had a slightly older version than the one you listed so I re downloaded the watch manager app from the members app and it updated my version to the same version that you posted.
I'm on the latest beta for Galaxy Watch4 Manager and firmware, and I'm still getting numerous 'app keeps closing' messages for Galaxy Watch Manager. Fwiw, my Watch7 arrives tomorrow, but if there's any logs I need to upload, I don't mind waiting to switch over.
