GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
ReadPackage( "GeneralizedMorphismsForCAP", "gap/GeneralizedMorphismCategory.gi"); ReadPackage( "GeneralizedMorphismsForCAP", "gap/GeneralizedMorphismCategoryByThreeArrows.gi"); ReadPackage( "GeneralizedMorphismsForCAP", "gap/GeneralizedMorphismCategoryByCospans.gi"); ReadPackage( "GeneralizedMorphismsForCAP", "gap/GeneralizedMorphismCategoryBySpans.gi"); ReadPackage( "GeneralizedMorphismsForCAP", "gap/GeneralizedMorphismCategoryFunctors.gi"); ReadPackage( "GeneralizedMorphismsForCAP", "gap/SerreQuotients.gi"); ReadPackage( "GeneralizedMorphismsForCAP", "gap/SerreQuotientsByThreeArrows.gi"); ReadPackage( "GeneralizedMorphismsForCAP", "gap/SerreQuotientsByCospans.gi"); ReadPackage( "GeneralizedMorphismsForCAP", "gap/SerreQuotientsBySpans.gi"); ReadPackage( "GeneralizedMorphismsForCAP", "gap/SerreQuotientsFunctors.gi"); ReadPackage( "GeneralizedMorphismsForCAP", "gap/SerreQuotientSubcategory.gi"); ReadPackage( "GeneralizedMorphismsForCAP", "gap/Switcher.gi");