Jay MN,
This is the printed Lake District Bus Timetable- https://tiscon-maps-stagecoachbus.s3.amazonaws.com/Timetables/Cumbria/Lakes%20Connection/Summer%2024/CNL%20SUMMER%2024%20Lakes%20by%20Bus%20WEB.pdf
There really is no need to buy tickets through the App if it is playing games (and apparently even for us in the UK it is being a bit off at the moment for live tracking, not for tickets). Any ticket you need (one way, daily or weekly) can be bought from the driver of the first bus you board. Weekly tickets are purchased on a smartcard. On each bus you just hover the smartcard over the reader. When you buy a smartcard ticket you get a paper receipt. Keep that in case the smartcard malfunctions. The smartcard used to cost £1- a few weeks ago my card malfunctioned and I was nearly issued a new one FOC before the card started to function again, So I'm not sure if the charge is still there. Otherwise wait until you are here and buy on the app anytime before travel if that is your preference. I don't use the app but I believe you have to "activate" an app bought ticket before first use.
Lots of people use the app daily so it must be reliable. I am just old fashioned and prefer something tangible.
Mountain Goat is odd- they used to have a depot in Keswick and run all tours as pick up from there. As far as I can find out they lost School Contract work in town which subsidised that, so closed the depot. Alba Travel also closed their office and Lakes Supertours did not survive Covid- so no one does tours now from Keswick.
Various companies have run from Keswick between the early 1920's and Covid- so it is a strange situation to be in now.
There are many day out possibilities depending on your fitness levels- if it was a weekend I would say use the 509/UB1 to the back of Ullswater (Howtown)- some of which loop round the lake to join the 508 route. Just beware that on the 509 Askham looks enticing. But every time I try to do Askham a bus is used which is too big to go over Askham Bridge, so they have to divert on the way to Lowther. It is a standing joke in the area- if not a joke for Askham residents.
Another very good option on any day of the week is the 555 to Ambleside, then the 516 down Langdale, ending any of many possible walks at the Old Dungeon Ghyll (locally called the ODG) or the Britannia Inn at Elterwater.
Also you could think of doing the 77/77A Honister Pass Circular. Around Buttermere and Crummock Water there are any number of walks for all abilities. There are good pubs at Buttermere, Lorton (the Wheatsheaf- bus stops outside) and Loweswater. The bus doesn't serve Loweswater but I usually get off at Lanthwaite Green and walk down. The 77/77A is hail and ride so stops anywhere that is safe- ask if on board, stick your hand out to join the bus.