Well this is weird.
Did you have any prior installation of Invoice Manager in the system?

I 've found the component in a template that I had old and since it is mandatory to install the proper functioning of the plugin djclassfield I did not hesitate to install it but maybe it was an outdated version and I immediately uninstalled and I bought the new , but then again I can not install.

Well then that explains the problem my friend.
The corrupted version you installed is outdated (and probably has malicious code in it, too.. be careful). you need to do a clean install otherwise it won't work. delete all the files, all DB tables and install again.

How can I remove all the fields in the old version ? Can you give me a hand?

I removed everything even in the database , I resolved.

fields in folder /components/com_invoices and /administrator/components/com_invoices