I use version 1.30 and I don’t know if this will help, but NCH software saves files to a default folder created by the program which can be tricky to locate.
I recommend creating your own recordings folder destination – click on Options, and choose or create a destination (I have a desktop folder named ‘Recordings” for SoundTap projects.) At least you will then easily find and know if you are recording a file.
Also, when choosing “Record microphone input” under ‘Devices’ you must select the proper sound input device from the drop down menu, which I think would be your soundcard/audio driver on your motherboard if you are plugging directly via usb. The newer version options may be different, I don’t know, and I use an external audio interface (usb) and would choose that from the drop down list, although I only use SoundTap to record streaming audio from the internet; for recording from a mic or instrument I recommend using WavePad. Good luck !