ReaConverter 7 Standard is a large app made up of open source & free apps & code libraries -- IOW they took a bunch of separate apps & tied them together, at least partly using the Python programming language. I'm Not saying that's bad -- Format Factory for instance does the same thing & seems very popular -- but it does make for a large, sometimes less efficient solution. Whether it's worth the convenience of having everything bundled together is of course up to you. Do note that some of the code used is not up to date, e.g. one of the constituent apps has since been patched for security problems, while .ocx files themselves aren't really current.
The Basics:
The installation performed the following activity:
2333 files added
58 files deleted
21 files updated
214422 registry entries added
204 registry entries deleted
22 registry entries updated
Installed 8/10/2019 1:30:46 PM
The program's folder holds 1930 files 112 folders taking up 598 MB. The OCR portion, along with some stuff from the included Microsoft C/C++ runtimes is stuck in the ProgramData folder [& copied to Users\All Users\], C:\Users\ [UserName]\ AppData\ Roaming\ ReaConverter7\ get configuration files, Program Files\Common Files\ gets some of the older C/C++ runtimes, while 3 versions of those runtime files are added to C:\Windows\System32. Most of the registry entries are for practical purposes irrelevant -- they involve the poorly documented Component registry hive -- but you still get quite a few because of those C/C++ runtimes, a few .ocx file entries, and more importantly, a folder monitoring service that's part of the app.