Hi Im on windows 10, I downloaded the latest version from the link at the top of most pages... when installing it gets to the step that says "click next to uninstall old version" I click next and it says "internal error extract  temporary files: no files matching "{temp\ClickOnceUninstaller.exe" found

Not sure what to do about this.. Im going to look over all my files and see if I have anything from the song manager on here but I dont remember installing it since the remastered update..

Read this thread for solution.  You have a really old version of CFSM installed and you need to manually uninstall it first.  Alternatively, download the 1.3.0.1 version which should not have this issue.  Let me know if it works for you.

Thank you so much.  I could not find that info when I looked my apologies. Indeed that was the issue and my memory returned after reading this... what happened was and forgive me If I'm not making the most sense here I'm out of it today but boy I feel silly now lol..

1. when I updated to win 10 from 7 I opted to keep most of my files and installations but of course sometimes when updating OS some installations may not be marked in the register anymore or icons, shortcuts may vanish.. sometimes installers need to simply be run again only to pass the files already in place or replaced by comparable ones.... anyways getting of track point is I didn't see any evidence of the program anymore and plum forgot I didn't uninstall it before.

2...Also. It didn't  help that when rocksmith remastered came out many CDLC's ceased to function so I got rid of them and did a clean install of RS and decided to wait  until a fix is available.. Flash forward  to today... I  checked out the site, I remembered what to do and began looking for an updated DLL any other fixes and  improvements  to my great joy! but...when it came  time for this tool which I loved before...  I couldn't for the life of me figure out what was wrong... worse case the pregame was buggy and Id have to wait long for a fix but now I know thanks to you it was user error lmao.

solution was exactly as you said I had to manually delete all the files assorted with the song manager which was a  pain cause somehow I had TWO DIFFERENT VERSIONS INSTALLED IN TWO FOLDERS? and the  uninstaller failed on one probably due to me manually deleting some files.. needed to search and clear em and I ran a registry cleaner to be safe too.. Now it works just fine!
 

SIDE-NOTE: Its hard to believe how time flew by and the vast difference between version number on here and the one I had...  the one I had that gave me the trouble was I cant remember but it was years old..  I think. but apparently I had a later one 12.0.40629.0 which seems  higher then the current one  since 3 is lower then 12 but the format is obviously just different. This one is not digitally singed like the other one but at least It wrokes and seems better and less choppy.