Some Windows users experience this issue. Absynth will not start. Windows error reports mention ucrtbase.dll failure. In this case, this is the workaround:
You can try to enable: "Beta: Use UTF-8 for worldwide language support".
You can find this under:
Windows Start > Settings> Time & Language> “Date, time, & regional formatting ”>“ Additional date, time, & region settings ”> Region> Administrative> Change system locale
If deactivated, activate the check-box "Beta: Use UTF-8 for worldwide language support".
Then restart the computer and try again.
(Sometimes the system language needs to be set to English instead)