Nextcloud Desktop doesn´t start and no synchronisation

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Nextcloud version (eg, 18.0.2): NC 2.6.4
Operating system and version (eg, Ubuntu 20.04): Windows 10
Apache or nginx version (eg, Apache 2.4.25): - (what´s that?)
PHP version (eg, 7.1): - (what´s that?)

The issue you are facing:
Nextcloud Desktop doesn´t start, when I click on the symbol there´s short.y the blue circle indicating progress, then nothing. I´ve reinstalled (without uninstalling, just re-doing the installation file), no change.
Therefore, there´s no synchronisation with the browser, nor my other laptop.

Is this the first time you’ve seen this error? (Y/N): Yes

The output of your Nextcloud log in Admin > Logging: sorry - ?