There is now some action required (don’t be frightened, just do it step by step):
ToDos
Add spice power supply (VDC source from Simulation_Spice library).
Define input, add input supply for DIVIDER (PULSE source) and TP2 (VDC or PULSE source).
Find and attach 2N3904 transistor models (not all models from the web are functionable!).
Add and attach 7474 subcircuit (to allow dual 7474 in one footprint/package).
Find and attach 7474 model (for both see More simulation examples for KiCad/Eeschema/ngspice - #3 by holger or Spice models and model parameters for ngspice circuit simulator).
Add value from ALTIUM_VALUE to VALUE fileds (in Symbol Properties window) for each resistor and capacitor.
Add load resistors 10Meg to the outputs Q1 and Q2 (and its inverted ones) invers, to get analog signals for plotting.
Add .param vcc=5 into a text box to enable 5V operation of 7474.
Provide adequate simulator settings:
(no current or power measurements, ltps compatibility, tran with timing according to DIVIDER input).