Although the Independent Party of Oregon had a government-administered presidential primary last month, that primary will not determine whom the party nominates. The party will choose its nominee in July, with a mail ballot to all its registered members. Instant runoff voting will be used. Oregon permits fusion, so the party is free to nominate someone who is also the nominee of another party.
See this article. The article says the party would not be free to nominate someone who sought the nomination of a major party and lost the presidential primary, but based on precedent, that is not correct. In 1980 John Anderson ran in the Oregon Republican presidential primary and was still permitted to be listed in November as an independent candidate. However, it is unlikely that anyone who ran in the Democratic or Republican presidential primary in Oregon would want to be listed on the November ballot as the Independent Party’s nominee in any event.