I got same problem, Not enough space!hap lite upgrade issue is not fixed! I have a hap lite with very very very basic config (wifi pseudo bridge to local ports + dhcp client). I am running 6.45.1 and if I try to update to 6.45.3 I get an error : "ERROR: not enough disk space, 7.3MiB required and only 7.3MiB is free." ... I have no files on the device.
Looks like 16MiB flash size on hap lite devices was a very bad decision for mikrotik .... hope they learned a lesson from this fiasco!
Free HDD Space: 7.3 MiB Architecture Name: smips Board Name: hAP lite Version: 6.45.2 (stable)