IVPN review
IVPN gives you an account ID to sign in with, so you can open a VPN account without an email address. The Standard plan is available by the week and already lets you route a connection through two servers.
Keep the account ID somewhere you can find it
IVPN uses that ID in its apps and on its website. If you lose it, the help page says support may be able to look it up using details from your last payment. Save the ID when you sign up so you can find it when you move to another device.
Check what Standard already covers
Standard covers up to five devices and includes Multi-hop and the built-in AntiTracker blocklist. The Plus plan adds the separate Mailx and modDNS services. They use their own credentials and require a valid email address. If you're curious about using two servers for just one session, PrivadoVPN has a Windows option that switches back to a single server next time.
Anabel’s take
I'd start with a week on Standard. I'd pay for Plus if I wanted to make email aliases or set my own DNS rules. For just the VPN, I’d stay on Standard.