Most likely the launcher is blocked by firewall or antivirus program, please try follow this guide:
Capture a screenshot with the problem, or a short video showing the problem (the one you posted is good enough)
Open Windows Command Prompt (press Windows + R), then type: %HOMEPATH%\AppData\Local\Ultimate Admiral Dreadnoughts\log
There will be log files from the launcher (e.g. 30.07.21.txt)
Please copy the latest log file, then contact Xsolla support team via live chat option (help.xsolla.com) or email (support@xsolla.com), describe your issue in details and attach the log file, the screenshot or a link on video.
Please keep us updated on the problem, hope it will be resolved soon