Insufficent space on update to 7.2.0

[HEGOM]

hi all.
I was trying to update moode from 7.1.0 to 7.2.0 , but when i click on install , i receive 

Insufficient space
Update cannot proceed without at least 500M space.

Iam running on this raspy:

moOde release = 7.1.0 2021-03-15
RaspiOS = 10.6
Linux kernel = 5.4.77-v7l+ #1371
Platform = Pi-4B 1.2 4GB
Architecture = armv7l (32-bit)
System uptime = up 4 minutes
Timezone = Europe/Rome
Current time = 2021-05-16 16:06:29

Host name = moode
Ethernet address = xxxxxxxx
Ethernet MAC = xxxxxxxxx
WLAN address = unassigned
WLAN MAC = no adapter
WLAN country = US

SoC identifier = bcm2711
Core count = 4
Kernel timer freq = 100 Hz
SDCard freq = 50 MHz
USB boot = not available
Warranty = OK

Root size = 3.4G
Root used = 89%
Root available = 385M
Root expand = not expanded
Memory free = 3227 MB
Memory used = 231 MB
SoC temperature = 36.5°C
Throttled bitmask = 0x0
Throttled text = No throttling has occured

so i think i have memory enough to run update. Please anybody can tell me what can i do to solve this? 
thanks in advance.

[HEGOM]

i found the solution. i had to expand filesystem, so it could manage all the SD free memory.
Installation was smooth then.