The first fix has already been released on Steam:

#1 Hotfix released!
29. Mai um 16:13 Uhr - Aerosoft

Changelog:
- fixed broken questgiver queuing behavior
- fixed issue with main menu being broken when fmod failed to initialize (soundcard related issue)
- fixed bug with scenario initial savegames not working on some systems
- fixed missing or misassigned icons and assets (objects, events)
- added tooltips for patients looking for stations (thought bubbles)
- fixed "RequireBedRoom" build error
- added missing animations for the shooting range
https://steamcommunity.com/games/809720/announcements/detail/1616142961152889757

I'm curious when GOG gets the hotfix, or from GOG only the big updates with version number will be published.

Translated with Google

Rescue HQ - The Tycoon | #1 Patch
6. Juni um 14:19 Uhr - Aerosoft

Patchnotes:
- added "Sandbox Berlin" scenario
- fixed vehicles not returning from some emergencies and at end of scenarios
- added reputation gain to investigation board (tooltip already stated it but it didn't happen)
- vehicles now have a limit for how many and which kinds of visitors they can carry (patients, prisoners)
- fixed the trauma station alignment and access
- performance optimization that increase FPS rates
- fixed shooting range animations, no longer rotates on use
- fixed assets not being loaded properly from mods downloaded from the steam workshop - existing asset-mods will need to be reuploaded.
- fixed bug with outlines - they also now properly distinguish between "hovered" and "selected" object outline styles
- camera movement bounds update according to level bounds
- chinese: tutorial texts are no longer slightly cut off at top end


Your Rescue HQ - The Tycoon team

https://steamcommunity.com/games/809720/announcements/detail/1613891797101438143

Changelog for Update 1.02 hotfix (added 12 June 2019):

In the last patch there were a few problems we want to fix with the hotfix now. We’ve fixed the problem with the firefighters and the station and have changed the endless mode a bit (Sandbox mod). We want to say thanks to everyone who took part in the fault repair and supported us. We look forward to talk to you again with news soon.

- FIX: Actors use stations instead of ignoring them (happened when you had less than 10 people hired)
- FIX: Left-most item in Timeline properly updates it's length
- FIX: gain "Access All Areas" achievement when last object is unlocked
- FIX: EndlessMode starts immediatly instead of waiting until next day shift (this also affected sandbox-mode, so you will get emergencies from the very beginning)
- Vehicle HP bar visible in Dispatch menu
- Vehicle HP numbers visible
- Some UI colors tweakes (Top Left HUD, Timeline)

And on GOG?


Changelog for Update 1.03 hotfix (7. Aug. um 10:32 Uhr - Fabian Boulegue [Aerosoft]):

Major Changes:

- @Someone's SFPD vehicles are now part of the mainmod, replacing the original SF Police vehicles. Thanks @Someone
- Funding replacement of SFPD vehicles from old savegames
- Needs rebalance: Adjusted intervals & range variety to a higher spread, which makes situations like ALL THE CREW NEEDS TO PEE AT THE SAME TIME much less likely.
- Mirror is now unlocked in SF :wink:

Dispatch Window:
- Traits on actors now have a highlight if they synergize with an active emergency Tag
- Changed equipment selection UI. Added a button to send out all available of a single type.
- Added descriptions to all tooltips in "Required Assets" section (i.e. traits now describe what they do) Actor Inspection
- Added needs display for actors
- Actor now shows department (if it exists)

Minor Changes & QoL
- Vehicle Maintenance is enabled by default and does not turn off automatically
- Jail Cell Bench is enabled by default and does not turn off automatically
- Added mod compilation error messages
- Additional ita loca improvements
- several minor UI & layout updates

Squashed Bugs:
- FIX dispatch map overlaying window
- FIX font breaking with certain characters
- FIX success rate tooltip being active from beginning
- FIX storage items were sent out when 0 are assigned in dispatch
- FIX items were created when 0 are assigned in dispatch

Rescue HQ - The Tycoon | #5 Update
Mi., 4. September 2019

Update time again! :steamhappy:
- Updated HUD to be cleaner. Now highlights Performance Rating and shows weekly spending.
- Updated Financial report UI and prediction algorithms for clearer visualization of weekly income and spending.
- Fixed a nasty bug which lead to wages not being payed at End of Week.
- Updated Shift Settings UI (at End of Week) to show filter and worker state more clearly.
- Fixed some bugs, including not being able to change hotkeys because the popup did not show up.
https://steamcommunity.com/games/809720/announcements/detail/1608270539793323476

Winter is Here! New beta branch update
Di., 17. September 2019

Changelog:
- Added two new Scenarios: Chicago in Winter (Medium & Hard)
- Updated US Medical vehicles (visuals)

Added 6 new character traits:
- PoliceBiochemical (Seasoned Police) +1 police on Biochemical emergencies
- PoliceStreetCop (Seasoned Police) +1 policestreet on Urban emergencies
- MedicIndustrial (Seasoned Medic) +1 medic on Industrial emergencies
- MedicHouseDoctor (Seasoned Medic) +1 medic on Urban emergencies
- MedicBiochemical (Seasoned Medic) +1 medic on Biochemical emergencies
- FireFighterChemical (Seasoned Firefighter) +1 firefighter on Chemical emergencies

And last, but not least, the feature everyone has been waiting for:
- Vehicles now Drive away along the street.
https://steamcommunity.com/games/809720/announcements/detail/2978491455753635260

Winter is here update out now!
Mi., 9. Oktober 2019

Changelog:
Added two new Scenarios: Chicago in Winter (Medium & Hard) Updated US Medical vehicles (visuals)

Added 6 new character traits:
- PoliceBiochemical (Seasoned Police) +1 police on Biochemical emergencies
- PoliceStreetCop (Seasoned Police) +1 policestreet on Urban emergencies
- MedicIndustrial (Seasoned Medic) +1 medic on Industrial emergencies
- MedicHouseDoctor (Seasoned Medic) +1 medic on Urban emergencies
- MedicBiochemical (Seasoned Medic) +1 medic on Biochemical emergencies
- FireFighterChemical (Seasoned Firefighter) +1 firefighter on Chemical emergencies

And last, but not least, the feature everyone has been waiting for:
- Vehicles now drive away along the street
- Language names are now in their respective language (not translated lol) - adjusted water area for emergencies
- Adjusted level 3 emergency chances for chicago contagion
- Several minor bugfixes regarding icons and scenario text
- Standard Ambulance has a new mesh for US
- Fixed subPump station missing preview mesh
- Added the icons for new actor traits in chicago scenarios
- Police now show up for day shift in chicago
- Buildable and purchasable ground in chicago now properly show snow / cleared state

https://steamcommunity.com/games/809720/announcements/detail/1603770112079724527

Don`t buy this Game here, its not the newest version on GOG.