I am updating VM on my site from 3.2.14 to 3.4.2, but every time I install update it causes my site to crash. The only way to fix is to restore from backup. Is this a bug or something else? My site is on joomla 3.8 and PHP 5.6
need far more info than this!
logs? errors? debug?
probably not connected but php5.6 is getting very old now .. I run all mine on php7.2
do you have a "test" or "development" domain? xampp etc?
You need to have error reporting on to see the problem.
IF YOU HAVE A TEST DOMAIN ETC, NOT A LIVE SITE.
if the installer is failing, you could do a ftp style upload, and then go to the extension manager/discover