Hi Wolfgang,

<EWLS> Exactly What Lee Said

It must be ensured that the TPS update received by the end-user was created
from exactly the *same* TPS files that he has installed, or the expansion
will fail.

BTW, compressed and/or encrypted files are very bad delta patch candidates.
When such a file is updated, the size of the upgrade file could increase
considerably. This is because two nearly identical files will usually
appear radically different (in their 'byte level' binary footprint) once
they are compressed.