Redirects (status codes 301, 302, and 303) are in general not allowed as they are not supported by the OGC Web Service standards.
In fact OWS common 2.0 (as used by WCS 2.0 ~ so in scope here for INSPIRE download service) tells us:
Clients must recognize and handle the 200 status code as well as those listed in Table 26.
Clients should recognize and handle other HTTP status codes as well, e.g., HTTP redirect
codes (301, 302, 307).
In fact OWS common 2.0 (as used by WCS 2.0 ~ so in scope here for INSPIRE download service) tells us: