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Thank you very much.
Now I was able to install ElacticSearch with the older MSI version. This is the path I put in the PowerSearch options: C:\ElasticElasticSearch.exe

I have some doubts about the operation:
1.- I started to do the first indexing of my only library, but Pdftotext starts to open files in cascade which saturates the screen, so I had to stop it. The path in options that I put is: C:\Program Files\Glyph & Cog\XpdfReader-win64\xpdf.exe
Is it ok?

2.- I have a very large library of more than 36,000 books in pdf, epub, mobi, cbz, cbr and doc. (221 gb) on a ssd for faster access. I saw in the thread that Power Search goes up to 10,000, but it was not clear to me if it is a limit on initial indexing or is it a limit on search results.

3.- Seeing what other users have taken I think my library would be indexed in several days, I have no problem with that. But is there any way to index the first time in parts so as not to saturate the computer?

4.- I left 1.5 gb of ram in ElacticSearch according to what I read before. In Windows 10 Task Manager I saw that Calibre, using Power Search, consumes 30% of the memory and has a high power consumption.
I use Calibre 5.37. Win10 and my pc is an Intel i5-4460 (4 cores), 3.20GHz. 16 gb ram. What other settings can be made to make the computer run smoothly while doing the first indexing?

5.- Finally, I have my Calibre library duplicated on another computer.
Is there any way to get the initial indexing to the other pc or do I have to do it again on the other computer?
Thank you very much for your answers.