While you can create new projects, you cannot open projects created in the trial version with a standard license later (unless you upgrade the trial) [1]. To make sure this fits your needs, are you looking to: Get started with a trial? (I can link you directly)
PVsyst is a specialized, professional-grade software for designing and simulating photovoltaic (PV) systems, widely regarded as the industry standard. Because it is a high-end engineering tool, there is no legitimate, functional "free" version that includes all simulation features permanently [1]. PVsyst Free Download
Design and simulate grid-connected, stand-alone, pumping, and DC-grid systems [1]. While you can create new projects, you cannot
like SAM (System Advisor Model)? Learn about the cost of a full license? While you can create new projects