Even better news for you all now. I've also managed to get my hands on V125 of Sanatorium... the last build of Sanatorium with the old gun ending, so here is a zip file containing all 7 maps... with both endings of Sanatorium included now.
https://mega.nz/file/4DBzjYhI#5u8LKBEG-ADxk_mpXVWucUC0lqLV1ps-JSYaoQITmJI