I just found this video while looking for something else. Its for Windows & FL Studio – managing VST plug-ins.
https://www.youtube.com/watch?v=KRXQ-y1ZfgU

Your welcome Arthur, hope you get it working.

Thank. I will try :)

If you cannot see the plug-in in FL Studio (under Babelson) OR in the default VST3 plug-In folder location (BBCMP_VST.vst3), then i would try to reinstall the plug-in from the beginning, it might be the quickest way to solve this issue that you have.
Did you already check
C:\Program Files\Common Files\VST3 – as LOSTKAFKA & JELLYŌ had suggested ? (if you have that folder on your computer ?).
.
I would have thought (like you would too), that the plug-in would have ended up in the default location for plug-ins after you installed it the first time, if there were no other options for an installation file path at first.
I’m not sure what else to suggest to you now, apart from reinstallation, at least you could manually move it to where you need it afterwards, like LOSTKAFKA suggested, then if you still have the same problem after trying to reinstall it, you could try contacting the developer – or it might be better to do your own internet search ?
Good luck with it, hope you have success in future with it. If i can help, your welcome.

Installation does not allow path selection

Not. I am using windows and fl studio

C:\Program Files\Common Files\VST3

I contacted them through Facebook and also got a very disrespectful response and they blocked me.

This copy & paste from Babelson’s web page might help you out in some way.
You might need to replace the file path using your own DAW’s name instead of Cubase or Ableton (as posted).
Are you using Windows or Mac ?
.
I CAN’T FIND MY VST3 PLUGINS IN CUBASE?
Re-setting VST3 plug-ins cache manually:

macOS: VST3 format:
1. Close DAW.
2. Using macOS Finder go to “~/Library/Preferences/Cubase 11/Cubase Pro VST3 Cache/” (without the quotes).
3. Manually delete the vst3blacklist.xml file (to delete the blacklist).
4. Manually delete the vst3plugins.xml file (to force a complete plug-in to rescan).
5. Re-open Cubase.

Windows : Ableton Live and VST3 format:
1. Close DAW.
2. Press Windows key plus R.
3. Enter “C:\Users\%username%\AppData\Roaming\Ableton\Live x.x.x\” (without the quotes), and click on OK. For example, if you are running Live 10.10 the complete path should be: “C:\Users\%username%\AppData\Roaming\Ableton\Live 10.1.0\” (without the quotes).
4. Manually delete the Preferences.cfg file.
5. Manually delete the Undo folder.
6. Manually delete the Template.als file (if present).
7. Re-open Ableton Live.

I know that the ongoing Covid situation is a challange for all of us. Musicians & developers are hidden very hard. Nerves are bare. My income is ZERO too at the moment. But to lose my attitude is to lose myself…

This guy codes very interesting software. But he has to learn how to behave.

Nice, thanks for that! :)