Reinstall deleted maps

Hello

I encountered many issues with last update of Garmin maps: route calculation fails with error message.

I contacted Garmin hotline in France 3 times in last January/February:
- 1st. time - They asked to reset the device and reinstall maps. This solution fails
- 2nd. time - They proposed to change the device as it use a beta firmware ... priced at 130 € (I refused)
- 3rd time - They said that the problem is known and that they are working to fix it: I just have to wait for maps update

So:
- I deleted all files corresponding to Garmin Cycle Map Europe on the device (to have enough disc space to install new maps)
- I installed Freizeitkarte for road biking and Openmtpmap_France for MTB
The problem doesn't occur with the new maps

Now I understand that I can use Gamin maps if I turn off "popularity routing".
But It seems impossible to install Garmin Cycle Europe maps on the device using Garmin Express as all previous files were deleted. Is there any solution?

Thanks in advance

Pierre