The "more than one LCD library found" is because there are multiple libraries named "LiquidCrystal" out there and your directory might have several installed.
1) Find where your IDE is installed. Mine is installed on E:\Arduino1.8.5. Yours will likely be on the C drive, perhaps in the Programs directory. It all depends on where/how you installed it.
2) Inside your IDE directory will be a subdirectory named libraries. Inside that subdirectory should only ONE LiquidCrystal library, so on my system I see something
E:\Arduino1.8.5\libraries\LiquidCrystal // You will likely see a bunch of libraries before and after this one...
If you see mutliple libraries, you need to delete one of them. But, which one?
In my BITX code, I use a TFT display, so instead of the LiquidCrystal library, I use:
Anytime I use a library that is not included in the standard IDE installation, I have a comment that tells you were to go to download that library (yellow above). I'm not sure which software you are trying to install, but look at the line that includes the LiquidCrystal library (e.g., #include <LiquidCrystal>) and see if the programmer left you a URL for the library. Rename the original LiquidCrystal library directory (e.g., OriginalLiquidCrystal) before you install the new library just in case you need to go back to the original setup if it doesn't work.
From: Dale Brooks KG7SSB <kg7ssb@...>
Sent: Sunday, January 7, 2018 4:14 PM
Subject: Re: [BITX20] worried now
This one is for Jack Purdum about the software loading. First I want to thank Jack for his wonderful contribution to our group. My problem is this. when I perform the compile on a known working program I get all these error messages such as: more than one LCD library found, unable to to download and a list of attempts to download. I have your book and sorry to say I haven't had much chance to really dig in and try to learn from it but I don't see anything that assists in troubleshooting the error codes and making the necessary changes to correct them. Jack can you or any one else assist me in finding information on how to troubleshoot and repair the compiler errors so I can reliable load my programs. Thanks in advance for the assistance. Dale kg7ssb