I have projected solids on a plane. I need to create a DXF for the laser. I’ve been requesting that there be a fix so that there are NOT multiple lines in the projections but that’s fallen on deaf ears. So, I need to hit each segment and use the “trim” 
︎ to delete the excesses until there’s only one. Of course, I don’t know until I delete and there’s nothing there. Then, command-Z to restore the last trimmed line. About every three to four of these operations the damn thing crashes. This has been a three+ hour nightmare today. I finally have ONE DXF I can sent to the laser. I have a large rocketry even in June and these new changes to Shapr3D are causing me to utter too many lexicons from the four letter dictionary. I once sang the praises of Shapr3D but NOT ANYMORE!
Please give me a link to download the pre-parametric Shapr3D until such time as you can make this NEW CRAP work.
16inch MacBook Pro m1Max w/ 64GB memory. A very capable machine with very incapable software.