Not easy, but still possible:
GW-R80.20> installer verify
** ************************************************************************* **
** HFAs **
** ************************************************************************* **
Num Display name Type
1 Check_Point_SmartConsole_R80_30_jumbo_HF_B36_W
in HFA
** ************************************************************************* **
Expert@GW-R80.20> clish -c "installer verify 1" >> /var/tmp/my.txt
Now in /var/tmp/my.txt:
Info: Initiating verify of Check_Point_SmartConsole_R80_30_jumbo_HF_B36_Win.tgz...
Interactive mode is enabled. Press CTRL + C to exit (this will not stop the operation)
Validating Install: 0% Validating Install: 0% Validating Install: 0% Validating Install: 0% Validating Install: 0%
Result: Installation is allowed.
CCSP - CCSE / CCTE / CTPS / CCME / CCSM Elite / SMB Specialist