I had to ask technical support how to manually update my screenconnect client locally and remotely.
The easiest way is to uninstall it from Add/Remove, which will force it to redownload.
(Also there may need to clear their cache (if using clickonce) by deleting the contents of C:\Users\%username%\AppData\Local\Apps\2.0\ )
However, this option was not described in either of this links:
Nor this link:
Also, the keyword search like "Manual Install" was not able to suggest it either.
Can you please update the documentation accordingly with text and visuals for the benefit of others?
Customer support service by UserEcho