Arista Legacy Pro isn't developer, it's one of their discontinued films. For developer, you want Legacy 76 powder developer as substitute for D-76.
Ariste EDU Ultra is rebadged Fomapan, and unlike modern films has an unhardened emulsion which is prone to pinholes if you use standard dilution stop bath. I recommend either diluting stop by half normal working strength or use two 30 second water rinses before fixing. Whatever you do, do not squeegee the wet film to dry it, you stand the risk of scratching the emulsion. Use a good rinse aid in distilled water and shake the excess water from the film before hanging.