sits in a sweet spot for several reasons:
If you have downloaded a "Standalone" or "Rheingold" package for ISTA 4.39.20, the installation process is relatively automated, but preparation is key. ista 4.39.20 install
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\BMWGroup\ISPI\ISTA] "INSTALLED_PATH"="C:\\EC-Apps\\ISTA\\ISTA\\" sits in a sweet spot for several reasons:
Create a clean directory root. Avoid "Program Files" because Windows UAC (User Account Control) blocks patch injections. the installation process is relatively automated
The SQLiteDBs are the largest files.