PVTsim 21.0.0 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. PVTsim lies within Home & Hobby Tools, more precisely Bookkeeping-Cataloging.
We recommend checking the downloaded files with any free antivirus. PVTsim18.exe, PVTsim17.exe, PVTsim16.exe, PVTsim15.exe or Pvtsim13_FlexLM_SPT.exe are the default file names to indicate this program's installer. The latest version of PVTsim can be downloaded for PCs running Windows XP/XP Professional/7/8/10/11, 32-bit. The actual developer of the free software is Calsep Webmaster. The most popular versions of the tool are 21.0, 20.1 and 19.0.
From the developer:
PVTsim is a versatile PVT simulation program developed for reservoir engineers, flow assurance specialists, PVT lab engineers and process engineers.
The PVT simulation package PVTsim is being used by leading oil producing and operating companies throughout the world.
PVTsim is petroleum phase behavior at the tip of your fingers.
You may want to check out more software, such as Broken X Disk Manager, Where Is It? or CATraxx, which might be similar to PVTsim.