I get socket error 10038 at startup.
How solve this error?
This is a common error. Try this:
HKEY_CURRENT_USER\SOFTWARE\Embarcadero\BDS\21.0\KnownIDE Packages
$(BDS)\Bin\LivePreview270.bpl
and change the data from "Embarcadero FireUI Live Preview Package"
to "__Embarcadero FireUI Live Preview Package"
(so, just add two underscores in front of the text)