Thanks Rikki.

Done all that regarding to the manual and also the upgradedescription at Ketron's
webpage.
So the steps works nice until last part when the saving shall be done, then the
error message turn up.

The "Upgrade for SD1Plus" should not cause any problems, because that c upgrade
is only a single diskette, and that part was no problem.
The problem starts when 4.0b are installed.

Happy Playing
GJ
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Cheers 🥂
GJ
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"Success is not counted by how high you have climbed
but by how many you brought with you." (Wil Rose)