We have discovered from feedback that Scenarios.bin files for routes 00...01 (Oxford-Paddington) and 00...03 (Newcastle-York) are included in the Upgrade. These files will overwrite those in your installation, and remove any non-default scenarios you have previously installed on these two routes.
The inclusion of these files is an error on our part.
As recommended in the installation instructions, if you do not wish to loose and non-default Scenarios for these two routes, please take a backup of the Scenarios.bin from folders:
...\Rail Simulator\Content\Routes\00000001-0000-0000-0000-000000000000
...\Rail Simulator\Content\Routes\00000003-0000-0000-0000-000000000000
We apologise for any inconvenience caused.
RSadam