Hi,
TrueSTUDIO is tagged as NRND (Not Recommended for New Developement).
The old company Atollic was acquierd by ST more than three years ago. TrueSTUDIO was actively developed until first release of STM32CubeIDE. Then there were just a few maintenance releases.
The download numbers on TrueSTUDIO have since that dropped significantly and many users have migrated to STM32CubeIDE (or other tools). Keeping the necessary IT-infrastructure of TrueSTUDIO online requires resources (securit updates, monitoring, ...), and we rather focus all resources on continued development of STM32CubeIDE .
As such all public IT-infrastructure related to Atollic/TrueSTUDIO was killed end of 2020 and replaced with re-directs to similar pages on st.com.
TrueSTORE, was not considered necessary to keep alive, due to the limited usage numbers.
Furthermore TrueSTORE example projects were very old, mostly relying on the StdPeriph drivers.
Thank your for your understanding!