Will not go into gear

Welcome to 2CarPros.

Is there any resistance in the clutch pedal? How was the system bled after the work was done?

Here are directions for bleeding the clutch system. Let me know if this is how you did it. The attached pictures correlate with the directions.

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2000 BMW 528i (E39) L6-2793cc 2.8L DOHC (M52 TU)
Bleeding Clutch Hydraulic System
Vehicle Transmission and Drivetrain Clutch Service and Repair Procedures Bleeding Clutch Hydraulic System
BLEEDING CLUTCH HYDRAULIC SYSTEM
Remove transmission underbody protection if necessary.

Pic 1

Unfasten nuts and remove clutch slave cylinder (pressure line remains connected).

Pic 2

Fit special tool 21 5 030 to the clutch slave cylinder (1).
Press piston rod (2) completely into clutch slave cylinder with the help of the spindle.
Connect breather devise to brake fluid expansion tank.

Note: Check relevant Operating Instructions for each device. Charging pressure must not exceed 2 bar.

Pic 3

Attach breather hose to breather valve (1).
Hold clutch slave cylinder in illustrated position (refer to figure) with special tool 21 5 030.
Open breather valve (1).
Once brake fluid emerges without bubbles, withdraw piston rod (2) on clutch slave cylinder with the help of the spindle, then press back in.
If no air bubbles escape, close breather valve (1), otherwise repeat this process.

Caution: Never remove special tool 21 5 030 from clutch slave cylinder if the system is pressurized, otherwise the piston and push rod can be forced rapidly out of the clutch slave cylinder.

Switch off breather devise and/or remove from brake fluid expansion tank.

Pic 4

Slowly retract piston rod (2) of clutch slave cylinder (1) with special tool 21 5 030.
Remove special tool 21 5 030 from clutch slave cylinder (1).

Pic 5

Fit clutch slave cylinder to the transmission.

Installation:
Replace self-locking nuts.
Tightening Torque, refer to Clutch M/T, Specifications.
Correct brake fluid level in expansion tank.

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Let me know if this helps.

Take care,
Joe