Why don't work the old versions?

platform = ststm32@5.5.0

UnknownPackageError: Could not find the package with ‘ststm32 @ 5.5.0’ requirements for your system ‘windows_amd64’

This version is indeed not registered in the PIO Registry (or it was deleted) and I don’t know why. (cc @ivankravets?)

However, you can reference the git link just fine.

[env:genericSTM32F103C8]
platform = http://github.com/platformio/platform-ststm32.git#v5.5.0
board = genericSTM32F103C8
framework = arduino

But now there’s another mistake. I use mbed.

Tool Manager: Installing framework-mbed @ ~5.51204.190524

UnknownPackageError: Could not find the package with ‘framework-mbed @ ~5.51204.190524’ requirements for your system ‘windows_amd64’

Hm, that seems to have been deleted then. (CC @ivankravets).

Maybe try per Error: Could not find the package with 'framework-mbed @ ~5.51105.190304' requirements for your system 'linux_x86_64'?

Sad…
I hoped there would be no such problems.
I need framework-mbed @ ~5.51204.190524

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