Do you mean deleting the library from a port so that you can reinstall it?
If that is this case, that is how I just did it:
{ :2: 1043 } ENTER PURGE
On my 49G+, the library is (was now) in Port 2, and its library number is 1043. The PURGE function is in the TOOL menu.
Purging a library is a lot easier on the 49G+. On the 48G series, there is the little extra headache of detaching the library from one or more directories before purging.
I have my copy of Stat49Pro on an SD card. I really don't bother with the USB cable or the interface software so if that is how you are getting the library onto your 49G+ this may not be helpful. At any rate, to reinstall the program I insert the SD card, go to the File Manager (left shift FILES), navigate to the library, RCL it to the stack, exit via ON(CANCEL), then store it port 2 via 2 STO. Then a soft rest with ON-hold-C and it is ready to be launched from LIB menu.
No need for me to purge any variable here. Since I just loaded the library from the card rather than download it into a variable using interface software, it didn't get stored anywhere else.
I really hope you get this up and running. I know the 49G+ has its critics in this Forum, and justifiably so, but I have really come to enjoy mine, and this powerful little library is one of the reasons.
Les