MasterPDFEditor-5.7.53-x86_64-1_SBo not finding installed libsane.so.1

MasterPDFEditor was upgraded this past weekend; it's always loaded and worked well before now on my Slackware64-14.2 desktop.

Today when I try to invoke it this is the result:
$ ./masterpdfeditor5
./masterpdfeditor5: error while loading shared libraries: libsane.so.1: cannot open shared object file: No such file or directory

However, libsane.so.1 is installed here:
$ ll /usr/lib/libsane*
-rwxr-xr-x 1 root root 1023 May 17 2020 /usr/lib/libsane.la*
lrwxrwxrwx 1 root root 17 Apr 1 08:23 /usr/lib/libsane.so -> libsane.so.1.0.30*
lrwxrwxrwx 1 root root 17 Apr 1 08:23 /usr/lib/libsane.so.1 -> libsane.so.1.0.30*
-rwxr-xr-x 1 root root 83764 May 17 2020 /usr/lib/libsane.so.1.0.30*

I need a pointer on finding the reason for this error.

Rich