Greetings!
Could you please clarify if you tried to run the launcher as Admin?
In case the problem still there, please contact Xsolla team through this workaround:
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. 28.10.19.txt), please copy the latest file and contact Xsolla support team via live chat option (help.xsolla.com) or email (support@xsolla.com), describe your issue and attach the log file.