Advanced Subscription Products for Magento 2 - All Questions

Generally, all the extension texts can be translated via CSV file, located on the following path: app/code/Aheadworks/Sarp2/i18n/en_US.csv
It should be enough to create a copy of the CSV file in that directory, rename it to the required locale, dk_DK for example, and make a translation of the second part of each line using a default translation method. Magento CSV files have the following structure:
"source string","translated string"
While making the translation, leave the "source string" entry unmodified, and change the "translated string" to your text.

Pending status is used before a charge occurs. Subscription becomes Pending after changing card data in an existing subscription.

Suspended status is used for the period when a subscription order could not be placed, but charging attempts have not yet ended. The situation you described can only be when a transaction was tried to be created and a response about the wrong token came from the payment gateway, the subscription became Suspended and the date of the next attempt was set.

There is no option to add subscription plans to all products in one action.
However, subscription plans can be assigned to products in bulk using "Magento product attributes update" mass action.

The thing is that because of a complete difference in code and logic between M1 and M2 modules, it is not possible to automatically move and keep processing the existing subscriptions from M1 on M2 system. Data migration script is available neither. You may want to finish or cancel M1 subscriptions and recreate them in M2 and start using them anew.
If you'd like us to help with the migration, we'll be glad to offer you our migration service:
https://aheadworks.com/magento-services/migration-to-magento-2

As for the upgrade, it is always possible to download the latest versions of purchased extensions in the My Projects And Licenses > View licenses tab of your account at our store or update extensions via Composer.
Also, here is a direct link to the Advanced Subscription Products M2 installation guide:
https://aheadworks.com/resources/subscriptions-and-recurring-payments/user-manual-subscriptions-and-recurring-payments#installing.

Now we dont have any ready query to database to share. You may want to truncate the following table:
'aw_sarp2_profile'
to delete profiles.
Orders are recorded in this table:
'aw_sarp2_profile_order'

Initial Fee, as well as other words, can be changed in the following file:
app/code/Aheadworks/Sarp2/i18n/en_US.csv
by renaming the 2nd part of the "Initial Fee Initial Fee" line.

It is compatible with Magento 2.4.0. As for the payment methods it supports, they are the following:
Braintree, Adyen Google and Apple Pay, Adyen credit card payments, NMI by Aheadworks, Cash on Delivery, Stripe credit card payments, Bambora APAC by Aheadworks, PayPal via Braintree.