iCal subscription link, permanent?

Hi,
we use jevents and would like to offer our visitors our appointments as an iCal calendar.

We had created a link to the export, but unfortunately the dates are no longer updated (in google calandar).
https://www.feuerwehr-debring.de/termine/kalender-abonnieren

Will such a link expire at some point?

How can we create a permanent link that ideally ends with no "cryptic" characters?

Best regards and thank you very much,
Benjamin

PHP Version : 7.4.14

MySQL Version : 5.7.28-nmm1-log

Server Information : Linux dd11918 4.15.0-135-generic #139-Ubuntu SMP Mon Jan 18 17:38:24 UTC 2021 x86_64

Fix jQuery? : Yes

Load JEvents Bootstrap CSS? : No

Max Input Vars ? : 3000

Club code set? : Yes  

User Agent : Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:86.0) Gecko/20100101 Firefox/86.0  

Joomla : 3.9.24

component_com_jevents : 3.6.12

component_com_jevlocations : 3.6.2

component_com_jce : 2.9.3

module_mod_jevents_cal : 3.6.12

module_mod_jevents_custom : 3.6.12

module_mod_jevents_filter : 3.6.12

module_mod_jevents_latest : 3.6.12

module_mod_jevents_legend : 3.6.12

module_mod_jevents_switchview : 3.6.12

module_mod_jevlocations_location : 3.6.2

plugin_actionlog_jevents : 3.6.12 (not enabled)

plugin_content_jevents : 3.6.12

plugin_content_jevlocation_embed : 3.6.2 (not enabled)

plugin_finder_jevents : 3.6.12 (not enabled)

plugin_installer_jeventsinstaller : 3.6.12

plugin_jevents_jevlocations : 3.6.2 (not enabled)

plugin_jevents_jevtimelimit : 3.4.4

plugin_search_eventsearch : 3.6.12

plugin_search_jevlocsearch : 3.6.2 (not enabled)

plugin_system_acymailingclassmail : 5.10.13 (not enabled)

plugin_system_gwejson : 3.6.12