It depends on what you want, but for a perpetual license, you can upgrade your Octane 4 license:
At the top click SHOP > Buy > Enterprise Maintenance Upgrade > Scroll to bottom (upgrade legacy v4) and click Upgrade Now
Win10 Pro 64 / Core i7-975 3.33GHz / 12GB RAM / GTX 1080 Ti + GTX 670 / 2x1920x1200 / MODO 14 "I am the resurrection, and the life: he that believeth in me, though he were dead, yet shall he live" - Jesus Christ
I'm a freelancer with only one 2 GPU machine. Are you really telling me the upgrade from my v4 perpetual license (which is already an upgrade from my previous licenses) is 499€, same price as buying from cero Redshift ?
Last I checked if you miss a year if RS maintenance it’s the cost of a new license to upgrade. We have shied cheap maintenance plans for V4 owners - i think it’s 15/month or so if you don’t need to keep the 2020 perpetual build (which isn’t really a necessity given how frequently updates come out)