OK, I will share two batch scripts that will do some of the job for us.
They work on Windows (tested on 64bit version of Windows 10).
Have to be downloaded, saved in a folder as .bat files.
And then executed.
The first (rename) script will check in the active user downloads folder for files that look like files downloaded from the eLearn website graphic files (like those ones):
They have to match the pattern (9 digits + image extension). To avoid accidental renaming of other files, it will ask to confirm the 3 digit codename model (in this case the 250) and will rename the found files to .svg. This codename can be seen on the 1st page of the PDF file (188 in this case) :
Those .svg files can be opened in InkScape. It's a vector graphic tool.
The second (conversion) script opens those files in InkScape and converts them to .emf files, so they can be put in the pdf file for example in the PDF-XChange Editor. After the conversion, the script will delete the .svg files.
You're then left only with the .emf files.
Both svg and emf files are vector graphics, so they can be zoomed without quality loss (I can zoom them up to 6400%).
Both scripts list the files to be renamed / converted and ask for a confirmation, so we can check it we're not doing any harm
Inkscape must be installed in the default folder (C:\Program Files).
The browser you're using to download the files must be set up to download them to the default Downloads folder.
If it's not the case, those script will not work unless modified.
Use at your own risk.
However there in nothing strange / bad / malicious in the scripts. The actions are preceeded by description. The scripts can be checked for example in ChatGPT, it will explain what is being done at which stage
