Optional but common for cracked games. Some antivirus software falsely flags adult game executables due to heuristic analysis. Disable "Real-time protection" in Windows Security just during the download/unpacking phase. Re-enable it immediately after.
Downloading and installing DESIRIUM PC -v0.12.0b- is a straightforward process. Here's a step-by-step guide: DESIRIUM PC Free Download -v0.12.0b-
Because this is a visual novel with light point-and-click elements, you do not need a gaming rig. However, the v0.12.0b update increased texture quality slightly. Optional but common for cracked games