On 24.09.2020 we tested to see whether the BOOSTAR-TWO and the GIGA IV would fit together in the launch rail and to prevent unpleasant integration surprises at the LRE. Espcially orientation of equipment and launch buttons are critical. All went well and within the hour the BOOSTAR-TWO / GIGA IV were erected and lowered from the launch rail. Again the orthodox method of first inserting and sustainer, raising it in the rail and then inserting the booster afterwhich the sustainer was lowered onto the booster was used.