Well, first I am a woman, not a man
but yes I read very carefully the READ ME. I only tried changing the permissions setting to 755 instead of 644 when it failed to work four times in row of deleting everything, reuploading, changing the config values over and over again.
I will double check the .htaccess but I uploaded it exactly as in the zip file. I even over wrote the file later after having uploaded. I don't know if something in the checksum is incorrect or something but there was no way to proceed from that error after a month of trying to install and research in questions on this forum.
Thank you for your feedback and advice, though.