Same issue here.

There seems to be no solution until Dell fixes their software, at which point you will have to manually uninstall the old version and reinstall the new one.

Weirdly enough, the "Alienware" version of support assist uses properly signed drivers.

I have the same problem with my Dell precision7730.

Same here.  Dell Latitude 5290.  

From setupapi.dev.log:

>>>  [Setup Import Driver Package - C:\Program Files\Dell\DellDataVault\Drivers\DellePSASysWin10\dddriver64Dcsa.inf]
>>>  Section start 2019/04/22 13:42:11.331
      cmd: C:\Windows\System32\MsiExec.exe -Embedding 4DF32C75867FD938CEDEFA77BB58B51B E Global\MSI0000
     inf: Provider: Dell Technologies
     inf: Class GUID: {4D36E97D-E325-11CE-BFC1-08002BE10318}
     inf: Driver Version: 02/27/2019,16.22.7.657
     inf: Catalog File: dddriver64Dcsa.cat
     pol: {Driver package policy check} 13:42:11.383
     pol: {Driver package policy check - exit(0x00000000)} 13:42:11.384
     sto: {Stage Driver Package: C:\Program Files\Dell\DellDataVault\Drivers\DellePSASysWin10\dddriver64Dcsa.inf} 13:42:11.385
     inf:      {Query Configurability: C:\Program Files\Dell\DellDataVault\Drivers\DellePSASysWin10\dddriver64Dcsa.inf} 13:42:11.390
     inf:           Driver package 'dddriver64Dcsa.inf' is configurable.
     inf:      {Query Configurability: exit(0x00000000)} 13:42:11.393
     flq:      Copying 'C:\Program Files\Dell\DellDataVault\Drivers\DellePSASysWin10\dddriver64Dcsa.cat' to 'C:\Windows\System32\DriverStore\Temp\{3d6f925c-40f0-784e-a95b-775f1daf2c9a}\dddriver64Dcsa.cat'.
     flq:      Copying 'C:\Program Files\Dell\DellDataVault\Drivers\DellePSASysWin10\dddriver64Dcsa.inf' to 'C:\Windows\System32\DriverStore\Temp\{3d6f925c-40f0-784e-a95b-775f1daf2c9a}\dddriver64Dcsa.inf'.
     flq:      Copying 'C:\Program Files\Dell\DellDataVault\Drivers\DellePSASysWin10\dddriver64Dcsa.sys' to 'C:\Windows\System32\DriverStore\Temp\{3d6f925c-40f0-784e-a95b-775f1daf2c9a}\dddriver64Dcsa.sys'.
     sto:      {DRIVERSTORE IMPORT VALIDATE} 13:42:11.412
     sig:           {_VERIFY_FILE_SIGNATURE} 13:42:11.438
     sig:                Key      = dddriver64Dcsa.inf
     sig:                FilePath = C:\Windows\System32\DriverStore\Temp\{3d6f925c-40f0-784e-a95b-775f1daf2c9a}\dddriver64Dcsa.inf
     sig:                Catalog  = C:\Windows\System32\DriverStore\Temp\{3d6f925c-40f0-784e-a95b-775f1daf2c9a}\dddriver64Dcsa.cat
     sig:                Success: File is signed in catalog.
     sig:           {_VERIFY_FILE_SIGNATURE exit(0x00000000)} 13:42:11.448
!!!  sig:           Failed to verify file 'dddriver64Dcsa.sys' against catalog 'dddriver64Dcsa.cat'. Error = 0xE000024B
!!!  sig:           Catalog did not contain file hash. File is likely corrupt or a victim of tampering.
!!!  sig:           Driver package appears to be tampered. Filename = dddriver64Dcsa.inf, Error = 0xE000024B
!!!  sig:           Driver package appears to be tampered, and user does not want to install it.
!!!  sig:           Driver package failed signature validation. Error = 0xE000024B
     sto:      {DRIVERSTORE IMPORT VALIDATE: exit(0xe000024b)} 13:42:13.935
!!!  sig:      Driver package failed signature verification. Error = 0xE000024B
!!!  sto:      Failed to import driver package into Driver Store. Error = 0xE000024B
     sto: {Stage Driver Package: exit(0xe000024b)} 13:42:13.939
<<<  Section end 2019/04/22 13:42:13.942
<<<  [Exit status: FAILURE(0xe000024b)]

Same issue on out of box Dell Precision 7530.