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I'm running something like :

create table #tmp (line varchar(max))
insert into #tmp
exec sp_helptext 'sp_Blitz'

declare @version varchar(50);
select @version=Left(line, CHARINDEX('''',line,CHARINDEX('''',line,1)+1)) from #tmp where line like '%@Version =%'
set @version = reverse(left(REVERSE(@version),CHARINDEX('''',reverse(@version),2)))
select replace(@version,'''','')

drop table #tmp