T-SQL merging 2 rows into 1 - tsql

Question

I have a table where I end up with two rows but I need a total of the data from both rows in one row, I can't use group by as I'm getting the usual must be in select list or contained in the group by clause.
DECLARE #Test TABLE
(
FirstName NVARCHAR(10)
,Ref NVARCHAR (4)
,UserName NVARCHAR(30)
,File1 INT
,File2 INT
,ID INT
,Active Bit DEFAULT 0
)
INSERT INTO #Test VALUES ('John','AAAB','AAA Admin',5,10,677,1)
INSERT INTO #Test VALUES ('John (P)','AAAC','AAAC Admin',6,15,765,1)
INSERT INTO #Test VALUES ('John Admin','AAAG','AAA Admin',6,15,765,0)
INSERT INTO #Test VALUES ('Jane','AAUD','AAA Admin',6,15,765,0)
INSERT INTO #Test VALUES ('Jenny','AAOZ','AAA Admin',6,15,765,0)
;WITH CTE
AS
(
SELECT *,ROW_NUMBER() OVER(Partition by FirstName Order by ID) RN
from #Test
)
SELECT * FROM CTE
WHERE RN=1 AND Active = 1
ORDER BY ID DESC
[![Results][1]][1]
The File1 and File2 Values from INSERTS 3,4,5 are duplicate data and aren't required in the result.
Text :
FirstName Ref UserName File1 File2 ID Active RN
John (P) AAAC AAAC Admin 6 15 765 1 1
John AAAB AAA Admin 5 10 677 1 1
Expected Output:

Answer 1

I'm not sure what you want.
DECLARE #Test TABLE
(
FirstName NVARCHAR(10)
,Ref NVARCHAR (4)
,UserName NVARCHAR(30)
,File1 INT
,File2 INT
,ID INT
,Active Bit DEFAULT 0
)
INSERT INTO #Test VALUES ('John','AAAB','AAA Admin',5,10,677,1)
INSERT INTO #Test VALUES ('John (P)','AAAC','AAAC Admin',6,15,765,1)
INSERT INTO #Test VALUES ('John Admin','AAAG','AAA Admin',6,15,765,0)
INSERT INTO #Test VALUES ('Jane','AAUD','AAA Admin',6,15,765,0)
INSERT INTO #Test VALUES ('Jenny','AAOZ','AAA Admin',6,15,765,0)
;WITH CTE
AS
(
SELECT
IIF(Tmp = 0, A.FirstName, SUBSTRING(A.FirstName, 0, A.Tmp)) FirstName,
A.File1,
A.File2
FROM
(
SELECT
*,
CHARINDEX(' ', FirstName, 0) Tmp
FROM
#Test
WHERE
Active = 1
) A
)
SELECT
A.FirstName,
SUM(A.File1) File1,
SUM(A.File2) File2
FROM
CTE A
GROUP BY
A.FirstName
Result:
FirstName File1 File2
John 11 25