In some cases, the ProStructures application does not open up / work / freezes mid-way or consumes a lot of memory and abruptly shuts down. Even after un-installing and re-installing, the application still does not function properly.
In such scenario, on must also delete all the locally saved / stored ProStructures app data which is by default located at the below locations - C:\Program Files\Bentley\ProStructures CONNECT Edition\ C:\ProgramData\Bentley\ProStructures CONNECT Edition\C:\Users\username\AppData\Local\Bentley\ProStructures\
NOTE: These locations may vary depending upon where these folders have been set-up during the initial installation.
After this, one can then restart the machine and go forward to re-install the ProStructures application. ProStructures then works as normal without any issue. P.S. - Please have a backup of all necessary and important files before deleting any content in the above mentioned paths like your personal dgnlib in the subfolder Prefs of AppData\local.