d5render/D5_Asset_Pack — reverse-engineered prompt

I want to make a simple installer for a D5 Render asset pack. The user should download several split archive files named like D5_Asset_Pack_xxxxxxxx.zxx plus a zip file, put them in one folder, and then run an exe. The installer should close or ask the user to close D5 Render, find the D5 Render install folder automatically if possible, check there is enough disk space, unpack and copy the asset files into the right place, and then finish with a clear message telling them to open D5 Render and confirm the assets are available without downloading again.

Please keep it very easy for a non technical user. Add clear error messages when files are missing, the archives are in different folders, D5 Render is still open, or there is not enough space. Include a short README with the exact install steps. If you need details about D5 Render paths, look up current docs online.