For such straightforward format it is better to avoid regexps and use simple string operations. For example, the text can be splited by \n and then each line can be splited by semicolon.
If you want to continue with regexps, try to replace VERSION with \w+ and " " with " *". I also not sure that the second grouping is necessary. Also, the ^ and $ can be added (the multiline regex option should be used then):
@"^(?<strElement>(\w+)) *:(?<strVERSION>.*)$"