[Bug 8704] Fix autoupdater on Linux

Author: livecodepanos

Toolset/libraries/revidelibrary.8.livecodescript

@@ -9774,9 +9774,9 @@ command revIDECheckForUpdates
          case "Linux"
             -- MDW-2015-12-19 [[fix_installer]] LC8-style setup filename
             if the processor is "x86_64" then
-               	put item 1 to -3 of the filename me & "/setup.x86_64" into tCommand
+               	put item 1 to -4 of the filename of me & "/setup.x86_64" into tCommand
             else
-               	put item 1 to -3 of the filename me & "/setup.x86" into tCommand
+               	put item 1 to -4 of the filename of me & "/setup.x86" into tCommand
             end if
             put tCommand && "install -foregroundupdate" into tCommand
             break