The supplementary material .zip archive contains CEPAM population projection results for 28 EU countries for all scenarios presented in the paper and files with country-level assumptions of fertility, mortality, educational attainment. Immigration and emigration counts presented in the results file can be used to replicate the projections. CEPAM projections prepared by Marcin Stonawski and Michaela Potancokova modify SSP2 scenario prepared by Lutz and KC (Lutz et al. 2018) and a large team of researchers at the Wittgenstein Centre and collaborators who contributed to the formulation of long-term assumptions of mortality, fertility and education (Lutz et al. 2014). Assumptions on fertility, mortality and educational attainment come directly from SSP2 scenario and are available also from the Wittgenstein Centre Data Explorer. [Wittgenstein Centre for Demography and Global Human Capital, (2018). Wittgenstein Centre Data Explorer Version 2.0 (Beta). Available at: http://www.wittgensteincentre.org/dataexplorer] CEPAM population projections were calculated using MSDem R package (Wuerzer and KC 2018) available at https://r-forge.r-project.org/R/?group_id=2281 Archive created on 2021/04/15 It contains the following files: CEPAM_EU28_country_results.csv contains projection results - population counts by age, sex, educational attainment and scenario - and counts of extra-EU immigrants and emigrants and counts of intra-EU immigrants and emigrants. Variables: scenario (Hv-He, Hv-Le, Lv-He, Lv-Le, Medium, ZEM, ZEM+25%fert, Double_intraEU, Zero_intraEU, No_migration) period (2015, ..., 2060) country (ISO alpha-2 codes) age (5-year age groups; 0, 5,..., 100) sex (male, female) edu (educational attainment in 6 ISCED categories; e1(no education), e2(incomplete ISCED 1), e3(completed ISCED 1), e4(completed ISCED 2), e5(completed ISCED 3), e6(completed ISCED 4-8) pop (population at the start of the period) emi_EU (emigrants to another EU28 countries, for the 5-year period) immi_EU (immigrants from EU countries, for the 5-year period) emi_extra (emigrants to the rest of the world, for the 5-year period) immi_extra (immigrants from non-EU countries, for the 5-year period) SSP2_EU28_fertility_assumptions.csv contains education-specific ASFRs for each country and projection period. SSP2_EU28_mortality_asumptions.csv contains education and age-specific survival ratios. SSP2_EU28_education_proportions.csv contain educational proportions for age groups 15-19, 20-24, 25-29 and 30-34.